Voicebox documentation

Testing Lanes & Pre-Push Gate

Voicebox enforces a multi-stage verification gate on git push via .githooks/pre-push and scripts/pre-push.sh. Tests are automatically classified into fast concurrent unit tests and isolated live integration tests by scripts/test-lanes.mjs.

1. Branch vs. main Push Policy

2. Gate Stages & Timeouts

Stage Command Execution Mode Default Timeout
Docs Touched node scripts/docs-touched.mjs Static git diff check (every push) Immediate
Docs Check node scripts/docs-check.mjs Boots a scratch server and probes it — landings only (voicebox-beads-8c0t); measured 36-46s at load ~5 VOICEBOX_GATE_DOCS_SECS (must outlast the boot)
Single Owner node scripts/single-owner.mjs Static scan of the tree (every push) Immediate
Unit Suite node scripts/gate-tier.mjs --tier unit Unit lane, one process per file 180s
Live Suite node scripts/gate-tier.mjs --tier live Server lane (--test-concurrency=2) then the Browser CDP shard runner (2 workers, one file each) — one process per file 3600s
Acceptance npm run accept End-to-end headless Chromium verification (page-acceptance.mjs) 45s
Full Manifest node scripts/gate-manifest.mjs aggregate --gate full --tier-dir <scratch> Folds the three tier records into <tree>.full.manifest.json 60s

The live stage bound is 3600s for two different measured reasons, both of which it satisfies: it outlasts the browser tier’s file time on a starved box (voicebox-beads-i9k0) and it sits above both the slowest isolated browser file and ISOLATED_FILE_MS (voicebox-beads-ncrg).

Each test tier runs its lane file by file, through scripts/gate-tier.mjs, and writes one TIER RECORD into the scratch directory the gate owns for the run. That is the same shape the fast gate (scripts/test-changed.mjs --gate) and the browser shard runner already use, so a file’s record means the same thing in either gate — and it is what gives each file its own exit code, test counts, duration and bound. The worker counts are the concurrency the gate already ran at (availableParallelism() - 1 for the unit lane, 4 for the server lane, 4 shards for the browser tier), so per-file dispatch is not a speed claim: measured on this tree, the unit tier is 18s either way and the server tier 38s — and the browser tier’s width is now two shards, for the reason the table below the tier-worker bullet records. A file that wedges is killed at its own budget and recorded timeout — one file’s failure, not the whole tier’s. On a non-passing file, the tier log and its retained tier record keep up to three failing TAP sections (including indented nested subtests, before their outer suite summary) (at most 20 lines of 240 characters each), including the test name and assertion even when later tests would push them past the old last-40-lines tail. If no TAP failure exists, the last 12 bounded lines identify a crash or timeout. The additive failure_evidence.version: 2 field also carries through to a manually folded manifest; passing files have no evidence field or extra log output. Evidence never changes the file status or the fail-closed verdict. Since voicebox-beads-a8a2 the same record also names the arm that failed as a FIELD (failure_evidence.test, the leaf subtest, null when a crash or a kill named nothing — the log line then carries arm="…" and a failure that cannot be named says so out loud rather than reading like one that was), and the UNIT tier now records loadavg_1m {start, end} per file, because every file in that tier is its own child process and the box around it is therefore attributable — the gap that left three unit-tier failures on 2026-10-15 needing a re-run to identify. Same rule as the browser tier’s windows: a reading or an honest null, and never a reason to retry, widen a bound or soften a verdict.

A stage that refuses prints where its records were kept and how to fold them:

[gate] pre-push: the unit tier's records are kept at /tmp/voicebox-gate-tiers.XXXXXX — fold them with:
[gate]   node scripts/gate-manifest.mjs aggregate --gate full --tree <tree> --tier-dir /tmp/voicebox-gate-tiers.XXXXXX

The manifest is the LAST stage, and a red TIER seals none. A receipt is for a gate that finished: if a tier stage, acceptance or the fold itself refuses, pre-push stops there and no <tree>.full.manifest.json carrying a pass is written for a reader to quote. The tier records are kept on the red path (above) so the same fold can still be run by hand. (One case is not “no artifact at all”: when the FOLD is the stage that refuses — a changed source with no mapped test, a --changed-base that names no commit — the artifact that records those problems is written, says refused, and the push is still refused. Only a run that reconciles and dispatches every file with a green terminal status is ever labelled pass.)

The artifact also says what the BOX was doing (voicebox-beads-zjpm.6). A manifest carries a host block — cpus, available_parallelism, and loadavg_1m: {before, max, after} with the moment it was read — and the browser tier keeps a loadavg_1m: {start, end} window on every file it dispatched, so a red file’s record and the shard runner’s failure block both say whether the file ran on an idle box or a saturated one. That closes a hole this file already documents twice by hand: the same browser file measures 12.2s at four-way idle and 39.1s in a loaded gate, and before this the artifact held only the 39.1s, so “flaky file” and “box at loadavg 27” were the same record and telling them apart meant re-running the suite. Two limits are recorded rather than papered over: os.loadavg()[0] is the 1-minute average and LAGS a burst by roughly half a minute, so max is the highest of the readings taken (never a claim about the whole run) and a platform that reports no load average records null, which is not a zero. It is attribution, not a waiver: nothing retries, isolates, lengthens a bound or lowers the shard width on the strength of a high reading, and a loaded box is still a red gate.

A browser file can also say WHICH CONDITION it failed under (voicebox-beads-zjpm.5.2). A record may carry a conditions array — one arm per condition, named from a closed set: standalone (the file alone), heavy_slot (the file while the heavy-job queue’s slot is held, with the holder NAMED), and shard_concurrency (the file inside the shard pool at its real width). Each arm carries its own status, secs, loadavg_1m window, worker_count, the command that ran it, and optionally its counts; a skipped or unknown arm must say WHY, and an unknown one is not asked for a duration it never had. All three arms are required — a two-arm check is refused by name, because two points are not a comparison. The sealer then derives a condition_verdict from the arms: pattern (standalone_only_fails, concurrency_only_fails, heavy_slot_only_fails, all_agree, mixed, or incomplete), disagreement, and agrees_with_shard. Two rules make it evidence rather than commentary: an arm that was skipped or could not be measured makes the whole answer incomplete with both other fields null (a comparison missing one side must never read as agreement), and a runner may not STATE that verdict — anything stated is checked against the arms and refused by name when it differs, so a disagreement: false beside an unmeasured arm cannot be printed. verdictOf never reads any of it: the arms DESCRIBE a shape, the file’s own terminal status still decides the verdict, and a high reading or a disagreeing arm is never a reason to retry, isolate, widen a bound or lower the shard width.

And a failing file must NAME the arm that failed (voicebox-beads-a8a2). The tier records now carry failure_evidence.test — the leaf subtest that failed — and a failed record whose v2 evidence does not name it is refused by name, because a failure nobody can name costs exactly one re-run, which is the cost the evidence field exists to remove. The requirement is deliberately narrow, and each narrowing is asserted: it is version-gated on the evidence’s own version so pre-a8a2 records still audit as the shape they declared; it applies only to failed; and it is never demanded for timeout or unknown, where a crash or a kill has no arm to name and its bounded tail is the name.

Targeted execution of those three conditions (voicebox-beads-zjpm.5.2) is not a triple run of the 248-file landing gate. A red per-file tier record carries condition_request: "pending", NOT measurements; optional conditions are absent until the detached diagnosis actually runs. The tier prints a named command such as node scripts/suite-conditions.mjs --tier unit --file tests/name.test.mjs --dir <scratch> --tier-record <scratch>/unit.json. Run it after the original heavy slot releases: heavy_slot means the suite runs directly OUTSIDE the heavy queue while a separate controlled holder produces measured contention — never a self-held lock or a suite that queued behind fleet-heavy. The other arms run standalone and at the existing tier worker width/isolation, each exactly once with start/end load readings. An unavailable holder is unknown, never passed. The retained tier update is atomic and cannot change the original status, counts or gate verdict. Ops owns the short nightly named-list schedule; fleet tooling owns the automatic post-slot invocation. Until that outer hook lands, a red tier remains honestly pending and prints the completion command. Invoke it DIRECTLY (not wrapped in fleet-gate: every fleet-gate job runs through fleet-heavy, which grants FLEET_HEAVY_HELD=1, and a parent that holds the heavy slot can only record heavy_slot as incomplete — the script prints a named warning and stays unknown, voicebox-beads-hibh): node scripts/suite-conditions.mjs --tier unit --file tests/name.test.mjs --dir <scratch> --tier-record <scratch>/unit.json. The CLI caps itself at four named files and max(120s, files × (3 × the file's arm bound + 40s)) — 120s for ordinary files, 220s while diagnosing tests/browser-shard-runner.test.mjs (voicebox-beads-eoy1) — and cleans up holder and child test processes on signals, so a direct detached run cannot wedge.

And a DIRTY worktree seals no landing receipt. The tiers run over the working tree while the receipt is keyed by the committed tree, so on a push that lands, scripts/pre-push.sh passes --tree-dirty to the fold and a dirty run is refused by name (working tree was DIRTY), with the refusal recorded on the artifact it declines to seal. The fast gate runs over uncommitted work by design and only records the fact (tree_dirty: true) — commit before you push a landing, or the receipt will not exist.

The stage commands come from the repository when it has a tier runner, and fall back to npm run test:unit / npm run test:live when it does not (the disposable repositories tests/pre-push.test.mjs drives supply their own scripts, like every other pluggable stage in this file).

Budget Overrides

Each bound can be raised or tightened per run without editing the gate:

A refusal names the variable to raise, so the remedy is copy-pasteable. tests/pre-push.test.mjs pins the resolution, the legacy fallback and its precedence (voicebox-beads-03po), so removing a link is a failing test rather than a silent compat break.

Automatic Test Lane Classification (scripts/test-lanes.mjs)

A harness-path signal requires an edge that consumes the path — an import/require, a write, a direct, variable-bound, or aliased spawn/exec (voicebox-beads-nr56, voicebox-beads-41mb; requiring an argument dependency so an unrelated spawn does not promote data fixtures, voicebox-beads-oktn) — because a test that merely holds a harness path as data is not driving anything (voicebox-beads-l79v).

Reading a launch target is not launching it (voicebox-beads-wkdp). A constructed path (path.join/path.resolve/fileURLToPath/new URL) used to be an edge on its own, so readFileSync(path.join(root, "server.mjs"), "utf8") — a test that reads the host as TEXT, with no server, no browser and no process — was filed live, and tests/csrf-route-seam.test.mjs had to assemble its filename (["server", "mjs"].join(".")) to escape the serial lane. A construction now counts only when the same file contains a launch call (spawn/spawnSync/exec/execSync/execFile/execFileSync/fork/createServer/ listen), read from the file’s code tokens only — words and punctuation, with comments, strings, templates and regexes removed — so a heredoc, a string or a comment that merely mentions spawn( cannot promote a fixture. (The first draft tested the predicate against the view the classifier handed in, which still carried string contents, so const note = "we should spawn( never)" was enough to file a pure read in the serial lane: review finding on voicebox-beads-wkdp, P2, with both the bug and the documented claim wrong. tests/test-lanes.test.mjs now pins a literal-mentioning fixture, and reverting the predicate turns it red.) An import of the fixture helper stays a launch signal un-gated — importing ./lib/server.mjs is how a test gets a server — and so does a write: writing a harness path stages a helper the test (or the next one) runs. Measured on main 187f80eb when this landed: 7 files moved from the serial live lane to unit (activity-, agents-read-, changelog-, fleet-get-, gemini-media-, presence-, tool-catalog-route-seam), 118 unit / 153 live from 112 / 160, with no file moving the other way. (The absolute counts move with the roster; the invariant is the seven transitions, which tests/test-lanes.test.mjs asserts by name rather than by count.) tests/test-lanes.test.mjs pins both halves: sources differing only in what they do with the same path (read → unit; write, spawn, import → live), and the real roster’s route-seam files as unit. Matching a quoted path anywhere in the text filed pure unit tests in the serial browser lane and hid them from the unit fast gate; that gap is pinned by a fixture test. The lane roster is checked as a complete, disjoint partition rather than pinning global counts that change whenever another branch adds a test. Critical boundary files retain explicit membership assertions.

Changing the classifier means sweeping its CONSUMERS, not just its own tests (voicebox-beads-3766). The unit fast gate cannot see this class: a classifier regression that empties a lane leaves tests whose fixture builds its own repository — tests/pre-push.test.mjs asserts all three tiers reach the one union — failing in a lane the fast gate never runs, so it passes while the regression is real. When scripts/test-lanes.mjs changes, run: tests/pre-push.test.mjs, tests/gate-manifest.test.mjs, tests/gate-tier.test.mjs, tests/test-shards.test.mjs and tests/browser-shard-runner.test.mjs. A fixture that wants a file in a serial lane must express a real edge (a constructed path is enough, e.g. path.join('lib', 'server.mjs')); an import is NOT always usable, because some fixtures really execute the files they write in a disposable repo that has no lib/, and an import there fails ERR_MODULE_NOT_FOUND rather than classifying. scripts/test-lanes.mjs lexes every tests/*.test.mjs file (ignoring comments and fixture string writes) to classify it into the appropriate lane. The roster is cached across processes (voicebox-beads-idy6): lexing 271 files costs 11-20s on a starved VM and every gate process paid it once (the answer-only probes later batched into one child in tests/test-changed-cli.test.mjs paid it ~17x through CLI probe startups, wedging the unit lane past its budgets). Each cache entry is keyed by sha256(classifier source + test file source) — a one-byte edit to one test file invalidates exactly that entry, a classifier edit invalidates all of them, so staleness is impossible by construction. The cache lives in the git common dir (voicebox-lane-classify-v1.json, shared by every worktree, never dirtying the working tree), is written atomically (tmp + rename), and a corrupt or unreadable cache is ignored and rebuilt rather than failing the gate. It is a cross-process disk cache, not a per-process memo: every call still re-reads every file, so the re-classification assertion in tests/gate-manifest.test.mjs keeps its strength. A test may declare its expected lane in a leading line comment, such as // @lane unit, // @lane server, or // @lane browser (before executable code). The declaration does not override classifier signals: node scripts/test-lanes.mjs --check refuses a mismatch and names the file, declared lane, actual lane and launch signal. A newly added file need not update a shared integer count; its own declaration can pin a critical boundary. The lanes are:

The Browser Tier’s Work Queue (scripts/test-shards.mjs)

The nested tests/browser-shard-runner.test.mjs fixture has a different owner from the production browser tier: its test process starts a runner which owns separately detached Chromium and per-file test groups. Its 240s fixture deadline now sends the runner group SIGTERM and allows a 5s cleanup window before SIGKILL fallback, rather than immediately killing only the runner PID and orphaning both groups. Even a runner that exits zero after the deadline cannot turn that timed-out fixture green. A browser-free negative control uses two detached groups and a temporary profile to pin the signal path quickly. A separate browser-gated control in tests/browser-shard-runner.test.mjs starts one real warm Chromium, holds only its nested ACP file process through an opt-in preload, expires the fixture once runner, browser and file groups are distinct, and asserts a terminal fast-gate: unknown/FAILED verdict plus removal of all three groups and the actual warm profile. This costs one additional Chromium startup in the browser tier; the production runner’s own per-file bound and markers are unchanged.

The shard runner does not expand a shell glob for its file list: it builds a queue from classify() and refuses it unless it covers the browser lane exactly once (assertExactCoverage), so a queue that drops, repeats or invents a file fails loudly before a single browser opens rather than looking like a faster gate. The queue is ordered longest-first — only the run’s TAIL needs help, because work-stealing fixes everything before it — and no file’s cost is predicted, so adding a roster entry cannot make the ordering wrong. tests/test-shards.test.mjs holds both claims as executable assertions: every browser-lane file runs exactly once, and the fast gate’s file set (npm run test:unit) is a subset of the full gate’s.

The Isolated Files (ISOLATED in scripts/test-shards.mjs)

Every browser file has its own Node process and ephemeral-port server; shared warm processes are scoped to one worker and each file’s storage lives in a disposable CDP context. Specialized files still own their browser process. The worker width comes from TIER_WORKERS.browser. Two files are independent of the others but not of the box, and both run alone, after the parallel queue, with every assertion and exactly once.

tests/ldxa-barge-in-browser.test.mjs drives the real audio path through Chromium’s fake-audio device, which the file’s own comments record as lagging under CPU load (+76ms idle, +366ms at 4-core load). It was isolated because with four workers it failed tests/ldxa-barge-in-browser.test.mjs:168 (“playback must be flushed, not left playing”, true !== false) twice in nine concurrent runs of the whole tier while passing every focused control — alone, alone through the runner, and beside three other browser files at four-way concurrency. The same assertion with the same profile was already recorded as environmental in voicebox-beads-y82w. voicebox-beads-9c3r reproduced the timing deterministically: the synthetic socket scheduled echoes before the page’s interrupt but delivered a queued echo after the client’s synchronous flush, restarting playback. The fixture now checks whether it is paused when an echo is delivered, not only when it is scheduled; its browser regression deliberately defers one echo until after the flush, proving that playback stays off without weakening the existing assertion.

A bashism in a #!/usr/bin/env sh gate is a parse error, not a style finding, so the file pins the shell. scripts/pre-push.sh runs under dash (/bin/sh -> dash here), where _x=() and ${_x[@]} are syntax errors: the hook then dies with exit 2 before any stage runs, and every push fails with no stage output — which reads as a red gate rather than a gate that never parsed. Measured while the full-manifest stage was written: adding one bash array made all nine fixtures in this file fail at once with 2 !== 0, and only sh -n scripts/pre-push.sh named the line. tests/pre-push.test.mjs therefore checks the shebang, scans the comment-stripped code for arrays, ${x[@]}, PIPESTATUS, set -o pipefail and [[ ]], and runs /bin/sh -n (the same guard tests/landing-preflight.test.mjs holds for scripts/landing-preflight.sh).

tests/pre-push.test.mjs measures wall-clock budget enforcement, so the box is part of its subject. Its fixture accelerates each stage’s budget through a timeout shim and asserts that the stage’s output appeared BEFORE the budget killed it (“LIVE OUTPUT BEFORE TERMINATION”), then that the refusal reports the measured elapsed time rather than the configured budget. The chain it must outlast is timeout → npm → sh → node, and on a contended box that chain’s startup is longer than the budget: measured 2026-10-12 on this VM, time-to-marker was 0.25s idle, 1.76–3.41s at loadavg 6 (32 CPU burners on 8 vCPU) and 5.2–6.3s at 8× oversubscription, while the shim’s budget was 2s and the suite’s own elapsed assertion accepts at most 10s — so no budget value was both large enough for a contended box and small enough for that assertion. At four workers the file failed the psfw union full gate (tests/pre-push.test.mjs:227, marker absent, slowest file 62.6s) and passed the xzrr union gate on identical blobs. It is also the tier’s slowest file (67.3s under four workers versus 32.6s alone), so contention was costing it twice. It now runs alone, and its shim budget is 5s — a measured margin over the same chain rather than a coin flip (voicebox-beads-0nt3).

The two longest live-tier files are the third and fourth casualties (voicebox-beads-i9k0, measured on the 2026-10-28 landing gates). tests/live-openai-browser.test.mjs (107s of file time) and tests/vision-controls-extraction.test.mjs (30s) both failed full gates on this VM while passing standalone on the same tree minutes later — the first on its own 20s/30s per-arm budgets and on a copy-versus-live-list comparison (28 !== 30, both arms, twice), the second on a 15s wait for the metadata line to report a camera stop whose click had already been delivered. Across four consecutive gates on ONE tree the failing set moved between browser files every run at loads of 9–14 on 8 CPUs, and the gate was the only work running: the contention those files lose to is each other. Isolating the two costs about two minutes of tier wall time (137s of file time that previously shared a shard) and takes the two longest, most timing-sensitive files out of the race.

Isolation remains a scheduling mitigation rather than the repair: the file still runs exactly once with every assertion, and tests/test-shards.test.mjs proves the two phases partition the queue and every name in ISOLATED is still a real browser-lane file (a renamed test would otherwise rejoin the parallel run silently).

A reload failure is evidence, not a timeout to waive. The mini-app classification check in tests/ux-bubble-stage.test.mjs keeps its 20s file-list and 30s tray content waits in the parallel queue. On the passing path, the test first waits for the reload’s actual CDP /api/files response within the original 20s budget, refusing failed/non-200, wrong-root, refused or wrong-file answers promptly; only a good response gets the remaining budget for the two exact named rows to render. The same readiness predicate must reject a missing-file mutant. VOICEBOX_RTSR_DIAG_CONTROL=1 also drives that impossible name through a short bounded wait and asserts the failure capture includes the real API response, DOM rows and screenshot (opt-in, not on every full gate). The 75s outer test bound only accommodates the original 20s Files + 30s tray waits and diagnostic teardown; it does not extend either inner readiness window. With VOICEBOX_TEST_EVIDENCE_DIR set, the test saves browser screenshots before the save and after the reload. A failed wait records CDP /api/files, /api/root and /api/mini-apps request outcomes and response facts (when available), the browser’s Files pane state and exception messages, and a screenshot path. A response with two files but no rows calls for a UI-render investigation; a refused listing, pending fetch or missing request calls for a different one. The 2026-10-13 union gate printed only last value false, so it cannot by itself justify calling the failure a load race or hiding the test in the isolated phase (voicebox-beads-rtsr).

A turn’s own record beats a report’s current value. tests/tasks-browser.test.mjs failed a union gate with timed out waiting for unrelated native text form turn completed; last value false (voicebox-beads-18lh), and the deadline was measured first because the obvious theory was one too small for the four-way queue: four copies with six CPU burners beside them (loadavg 7.05 on 8 vCPU, against the 8.5 that gate recorded) settled the turn in 564-776ms — about 20x inside the 15s default — so the deadline was not the defect and was not raised as if it were. What was wrong is what the arm looked at. It accepted only one of the report’s two terminal values (tone === "good"), so the room’s own refusal — which it writes as tone === "bad" WITH a sentence in #turn-report — was indistinguishable from a turn that never finished; a good report also LINGERS for REPORT_FADE_DELAY_MS (8s), so a report left by an earlier turn could satisfy the wait with no new turn at all; and nothing asserted that the click had reached the page. The arm now reads the form’s own state before and after the click (the submit handler clears #utterance synchronously in the click’s own task, so text still there means the real-mouse click never landed), waits for a NEW #session-log entry as well as a settled report, and on failure prints the page’s state, the page’s own /live frames and a screenshot. Driven: with /api/turn answering 503 the failure quotes the turn did not reach the server: closed box: the turn route is refusing; with a stale good report planted and no turn sent, the old predicate is satisfied and the new one is not; with #send disabled after the typing, the click is named instead of timing out.

3. Cross-Worktree Gate Locking & Exit Diagnostics

Before entering the live and acceptance stages on main, scripts/pre-push.sh acquires a host-wide file lock (VOICEBOX_GATE_LOCK, default /tmp/voicebox-gate.lock) and writes holder metadata to VOICEBOX_GATE_HOLDER (/tmp/voicebox-gate.holder.json). Concurrent landings wait for the lock rather than competing for Chromium instances (configurable via VOICEBOX_GATE_LOCK_WAIT_SECS or VOICEBOX_GATE_LOCK_DISABLE=1). tests/pre-push.test.mjs verifies serialization through event-driven observable synchronization (holding until the runner enters waiting, then releasing) and asserts negative controls for timeout refusal and free-lock acquisition.

Releasing the lock must not silence the gate. The close of the lock descriptor is guarded by a fd-2 redirect that has to stay grouped — { exec 9>&-; } 2>/dev/null — because exec 9>&- 2>/dev/null has no command word, and POSIX then makes both redirections permanent: fd 2 went to /dev/null for every line printed after the release. The manifest stage is the only stage that runs after it, so a full gate refused for a dirty worktree or an unreconciled roster exited 1 with a clean stderr and no reason a reader could act on (measured: sh -c 'exec 9>&- 2>/dev/null; echo x >&2' prints nothing). tests/pre-push.test.mjs asserts the manifest-stage refusal is readable, naming both the aggregator’s line and the gate’s own.

Each stage is bounded by GNU timeout with a 5-second kill grace period:

A killed run cleans up the fixtures it started (voicebox-beads-9xqs)

A killed gate used to leave its fixtures running. The reaper found /usr/bin/node …/worktrees/voicebox-merger/server.mjs still alive 121 minutes after the run that started it had been killed at its bound: 106 MB, 0% CPU, holding a port. No handler can prevent this by itself, because of how the pieces are detached:

So the cleanup has to be a sweep by attribution, not a handler chain: scripts/stray-sweep.mjs kills a process only when all three facts hold — its cmdline is a fixture shape (server.mjs, a wasm-worker.mjs execution cell, a browser or a browser helper), its cwd is this worktree, and it started at or after this run began. Ancestors of the sweeping process are excluded, and a sweep with no worktree is refused rather than becoming a box-wide kill. A fixture older than the run is somebody else’s, so a hand-started server is never a victim; another lane’s worktree is never a victim either, because the cwd has to match.

The rules that keep attribution honest, and what the first review of this change caught:

Both runners — runGate (scripts/test-changed.mjs, the scoped fast gate) and scripts/gate-tier.mjs (the tiered runner, which is what scripts/pre-push.sh drives the live tier through) — call one shared helper, sweepPreviousFixtures, once at the start: a gate SIGKILLed at its bound (timeout --kill-after, rc 137) runs no handler at all, so the only cleaner its fixtures get is the next run in that worktree. The window reaches back the fleet janitor’s four hours (VOICEBOX_STRAY_PREVIOUS_SECS) and ENDS at the instant the run began, so it can never touch a fixture the current run starts; anything older is scripts/reap-stale-servers.mjs’s subject, and a worktree that never runs a gate again relies on that janitor. (The first version wired this into runGate only, and the reviewer was right that a live tier — which runs under gate-tier, not runGate — could then be killed and leave its server for hours: voicebox-beads-qy8m, P2. The two runners now share the helper so they cannot disagree; gate-tier says [gate-tier] swept N fixture(s) left by an EARLIER run in this worktree: <pid> (<cmdline>) when it reaps one, verified by spawning a fixture before a gate-tier run and watching that line name it.) On top of that, each runner sweeps its OWN fixtures when a run finishes and from its signal handler (SIGTERM/SIGINT/SIGHUP — gate-tier handled only the first two before this change), and gate-tier also sweeps once the tier sequence ends. When it kills something it says so, because a swept fixture means a test file left a server behind — [gate-tier] swept 1 leaked fixture(s) from this worktree: <pid> (<cmdline>) — and that is the defect to fix, not the sweep to thank. It complements rather than replaces the fleet-wide scripts/reap-stale-servers.mjs, whose subject is a fixture older than four hours; this one is bounded by the run that caused it.

Verified: tests/stray-sweep.test.mjs (thirteen unit cases, including one real detached …server.mjs that is killed, a control in another directory that survives, the fail-closed and pinned arms, the window, the window’s boundary asserted with an injected clock (including the 50 ms quantisation slack, both directions), and a delayed sweep that must not backdate a newer fixture), a completed runGate leaving no fixture, a SIGTERM to a run with a fixture in flight leaving none (gate exit 143), and — for the run that is killed outright — a fixture older than the run being swept by the next run’s start sweep while that run still exits 0.

A test that has to name a fixture is classified live. The lane classifier treats --remote-debugging-port or a chrome path in a test file as “a browser over raw CDP”, and server.mjs as “a server process” — so tests/stray-sweep.test.mjs assembles those strings ("server" + ".mjs", "--remote-debug" + "ging-port=0") rather than spelling them, which keeps a 3.5-second file in the unit tier instead of the serial live one.

4. Landing Preflight — scripts/landing-preflight.sh

The gate answers is this tree good. A second question is asked in the minute right after it, before the push, and until now every answer was hand-built on the spot: would this push actually move the branch I am landing, to the commit I just gated? scripts/landing-preflight.sh answers that, once, with an exit code (voicebox-beads-vto3).

It runs a git push --dry-run at the real target ref (HEAD:refs/heads/main on the real remote) and reads the output as one of four verdicts. The order is the mechanism, not typography — a refusal line also carries a sha, so a loosely-matched “success” pattern can be satisfied by a rejection:

Verdict Exit Read from Answer
REFUSED 3 output contains the literal [rejected] (tested first) do not push: fetch, re-merge, re-gate the merged tree
NO-OP 2 output contains Everything up-to-date do not push: this is a true statement about a ref that is not the landing
OK 0 a parsed row whose both ends are the landing — <sha>..<sha> HEAD -> main — and whose new-side sha is a prefix of git rev-parse HEAD push
UNKNOWN 4 anything else, including a dry run whose command itself failed do not push

Both ends of the row are asserted, and that is the whole check. A row names two refs: the thing being pushed, and the ref it would land on. The first draft of this script matched only the left side, and the cross-family review caught it: a dry run aimed at wrong printed OK … origin/main would move — this tool committing the error it exists to prevent.

The way to assert a destination is not to paste it into a regular expression. That was the second fail-open, found by probing the fix for the first: with $LOCAL_REF and $TARGET interpolated into one ERE, --target 'main|wrong' turned the destination test into an alternation and answered OK for a row landing on wrong — measured, same tree, same bytes. So the row is parsed and compared literally: a fixed structural pattern with no substitution in it finds the candidate, the fields (old..new, source, ->, destination) are cut out, and each is compared with [ … = … ]. A flag can only narrow the question, never widen it. git rev-parse gets the same treatment: it ECHOES an unresolvable argument and exits 0 on git 2.43 (git rev-parse 'HE.*D' → HE.*D), so the precondition peels with --verify "$LOCAL_REF^{commit}" and rejects anything that is not a hex sha. And a refs/heads/ prefix is normalised once, at the top, so the flag, the refspec and the comparison cannot end up asking about different namespaces.

Two more answers, asserted rather than assumed, because both produce a false green if skipped: PRECONDITION (5) refuses to ask anything when the worktree is dirty or when HEAD already equals <remote>/<target> — an uncommitted merge leaves HEAD on the default branch, and then the dry run happily reports Everything up-to-date about a landing that never happened. IDENTITY-MISMATCH (6) fires when the row git would act on names a sha that is not HEAD here: the gated tree and the offered tree are different trees.

HEAD is the gated tree, and nothing moves that tie — including --local-ref. That was the third fail-open, found by the third-family reviewer and measured before it was fixed: the identity sha had been derived from --local-ref, so with HEAD at one commit and a second branch at a later one,

scripts/landing-preflight.sh --local-ref other
OK  origin/main would move to 6ed23ce — the tree standing here (6ed23ce…)   exit 0

while the tree standing here was 4afd4d5. The sentence was internally consistent and the verdict was wrong: the gate ran on HEAD, so an offer that is not HEAD is not the gated tree, whatever the row says. HEAD_SHA now comes from HEAD — --verifyd and peeled, full stop; the offer is a separate sha, named on the output line when it differs, and --local-ref can only change what is pushed, never what counts.

--check is the same trap in mode form: it asserts preconditions and asks the remote nothing, so its exit 0 is not a clearance to push. It now prints that on its own answer line, because an “OK” a caller could read as a verdict should say in the same breath that it is not one.

The sha length is read from the row, never hardcoded: git’s abbreviation follows repository size and core.abbrev, so 7 is a guess that breaks quietly on a big repo. The two refusal wordings this repo has actually printed — (non-fast-forward) when the pushed tip is an ancestor, (fetch first) when the tips have diverged and the object is not held locally — are matched by the [rejected] marker alone, because the reason after it is git’s prose and may change.

It is a plain script, not a hook: .githooks/pre-push and scripts/pre-push.sh stay unaware of it, and a --push-cmd stub plus --rehearse lets every branch be driven without contacting a remote. Argument handling is a verdict-safety surface, not ergonomics. A flag that is missing its value is a usage error (exit 1), never a verdict code — and three ways of being missing were measured:

The rule is a refname, not “non-empty”. That distinction was the reviewer’s finding on the round after the empty-value guard: --target=refs/heads/ is non-empty, so it passed, and then became EMPTY by stripping the prefix — --check printed PRECONDITION-OK … target=origin/ and exited 0. The script now asks git, rather than hand-rolling a test: git check-ref-format "refs/heads/$TARGET", which on this also refuses //, .., ., a name containing a space, mai.* and ma[n]in, and accepts main, min, main|wrong, feat/x and -x. Anything refused is a usage error (exit 1) with the name echoed back. One layer out, the same reasoning: --remote=nosuchremote used to spend a transport call to learn fatal: … does not appear to be a git repository and answer UNKNOWN — correct but unreadable, and an unconfigured remote is a fact about this checkout, so it is now PRECONDITION (5), naming the remote and listing the configured ones.

Every value flag also accepts --flag=<value> — the escape hatch that keeps a genuinely odd value (e.g. a filename starting with -) expressible, without letting the space-separated form swallow a flag. POSIX sh throughout (the DASH, NOT BASH case in tests/landing-preflight.test.mjs keeps it that way, and the trap it had to fix was a real one: dash reads a printf format starting with a dash as an option and dies with Illegal option --, which turned a REFUSED verdict into exit 2 until the literals went through printf '%s\n'), and tests/landing-preflight.test.mjs drives the real refusals, the real update row at four abbreviation lengths and a real forced-update row against a scratch repository with its own local bare remote — so the classifier is proven against git’s bytes, not against a transcription of them.

scripts/landing-preflight.sh              # ask once, before pushing at main
scripts/landing-preflight.sh --rehearse    # every verdict, push stubbed, no remote touched
node --test tests/landing-preflight.test.mjs

5. Acceptance Read Idempotence Check

During npm run accept, the acceptance harness verifies that read endpoints are strictly idempotent:

  1. Declares an isolated workspace root and seeds a known file before loading the browser page.
  2. Issues three sequential GET requests to /api/root and /api/files, verifying that all responses match and report the exact file byte count.
  3. Stat-checks the workspace directory afterward to verify that file contents, permissions, and nanosecond mtime/ctime timestamps were not mutated by read requests.

Verification Suites

node --test tests/pre-push.test.mjs tests/test-changed-cli.test.mjs tests/test-changed-gate.test.mjs tests/served-vs-disk.test.mjs tests/cdp-process-cleanup.test.mjs tests/transient-state.test.mjs

When verifying environment currency against the measured tree, tools/page-acceptance.mjs extracts static and query-bearing module and worker references (new Worker(...), new Worker(new URL(..., import.meta.url))), naming any unwalkable dynamic templates in both clean and stale reports (tools/served-vs-disk.mjs, tests/served-vs-disk.test.mjs). Browser processes driven by tests/lib/cdp.mjs and tools/page-acceptance.mjs run in isolated process groups (detached: true) with --no-sandbox --no-zygote --disable-crash-reporter. --no-zygote prevents Linux zygote/PID-namespace init stubs from dropping signals and surviving as unkillable zombies. Synchronous process.on("exit"), SIGTERM/SIGINT/SIGHUP, and finally handlers ensure all processes in the browser’s process group are reaped on normal close, abandon, signal termination, or unexpected test runner crashes, while monitoring crashpad handlers exit when the browser connection closes (tests/cdp-process-cleanup.test.mjs). The verifier that answers “did it really go?” is /proc/<pid>/stat rather than kill(pid, 0) — a zombie still holds a PID slot — and it fails CLOSED on purpose: only ENOENT/ENOTDIR mean “there is no such process”, while any other errno (EMFILE under load, EACCES where /proc hides another user’s processes) is rethrown, because reading a failed read as “gone” would turn it into a silent pass for a leaked browser (voicebox-beads-3lwx). That rethrow carries the ps table in its message, so an unexpected errno still says what the file saw instead of silencing the witness from inside the message it was meant to build (voicebox-beads-fwed); if ps itself cannot be run or fails, the message names why the witness is unavailable rather than presenting a misleading empty table (voicebox-beads-kud3).

Servers get the same treatment, which they did not always have: tests/lib/server.mjs reaped its detached children on process.on("exit") alone, and Node never emits that event for a signal, so a suite that was timed out or interrupted left its servers behind — one of them was only collected by the VM reaper after 122 minutes. It now registers SIGTERM, SIGINT and SIGHUP alongside exit, all four going through the one group-kill reaper, and a browser a test body spawns itself is registered with trackBrowserProcessGroup (tests/lib/cdp.mjs) so the same handlers cover it (voicebox-beads-selv). A subsequent ownership check (voicebox-beads-o71l) found that a failed or delayed kill could remove a still-live child from the reaper’s set; only the child’s confirmed exit event now releases ownership, and a timed-out stop retains its scratch directory until exit. A subprocess-only negative control simulates failed kills and checks the exit fallback without sweeping unrelated PIDs. This fixes the ownership gap; the cause of the originally observed green-tier orphan is still unknown. tools/page-acceptance.mjs already had both signal paths.

A test-name filter matching zero cases in tests/voicebox.test.mjs can run test.after before its asynchronous test.before finishes spawning a server. The suite publishes the startServer() promise before awaiting it and the after hook awaits/stops that exact child, including the zero-match path; a rejected start is already reaped by the helper. tests/voicebox-hook-lifecycle.test.mjs drives a disposable, bounded zero-match subprocess and checks the spawned server’s exact PID/start time is gone afterward (voicebox-beads-4thb).

The phantom-turns browser case in tests/voicebox.test.mjs waits for its navigated document’s own load and verifies the actual text-form submit listener before asserting zero POSTs on page load. That negative check stays: a page with seeded files must not send a turn by itself. Its positive control fails closed when the form/input is absent, the submit throws or the app does not cancel the synthetic event; it then waits, with a hard bound, for one matching CDP /api/turn request ID through response completion and one test-owned proxy ingress, rather than sleeping a fixed second. Blocking fused.js in the same browser is a negative control: the form still exists, but no listener intercepts it and no extra POST reaches the host. An opt-in VOICEBOX_TEST_PHANTOM_THROTTLE=1 focused run throttles only that browser (4× CPU, 250ms RTT, 64KB/s) before navigation, reproducing the measured early-submit race without changing product code (voicebox-beads-c8cq). The old full-gate failure’s cause is still unknown; this pins an observed test hazard, not an attribution of that failure.

The XSS assertion in tests/voicebox.test.mjs checks the CSP on the served GET / response (header and parsed meta), not a grep over raw HTML comments. It fails closed on absent or malformed script-src, checks inline script and handler permissions across simultaneously enforced policies, and pins both the prose-only comment that must pass and a genuinely permissive reordered policy that must fail (voicebox-beads-8tk2). The application CSP is unchanged.

The transient-state shape is guarded by a static scanner (voicebox-beads-zjpm.5.3). npm run transient:check (scripts/transient-state.mjs, tested by tests/transient-state.test.mjs) scans browser-lane tests for fixed delays immediately preceding assertions on page state — the defect shape that produced intermittent flakes across jeye, y1db, and 18lh. Candidates must be cleared by a named clause (ABSENCE, IN-PAGE, NO-ASYNC, or DELAYED-READ for a page read immediately asserted on the following statement) or the scan fails closed (exit code 1) naming the file and line. A loop alone is not a POLL clearance: a real poll re-checks the observable after sleeping, before the assertion, so it does not match the immediate-delay shape. Optional --list reports exact status assertions (single-/double-quoted strings or counts) without a preceding executable wait on the same observable in the same test and a block that encloses the assertion (a braceless conditional wait, commented-out wait, or wait named only in a test title does not clear it; an executable direct or static string-form callback on that observable does; dynamic/concatenated callbacks are not resolved statically), with an inline/public page-writer location where found or writer: unknown for review. A sleep at a loop’s end followed by a one-shot page assertion outside the loop is still a candidate. NO-ASYNC inspects the assertion’s compared operands, not its optional failure message. The list does not determine the gate verdict.

One case in tests/pre-push.test.mjs — the one that asserts a dropped front is named as a network cause — drives tools/page-acceptance.mjs end to end and therefore needs a REAL browser. Without one it SKIPS BY NAME with that reason rather than failing: the browser lane always provides a browser, and a standalone run without one is a named precondition, not a verdict on the network naming it asserts (voicebox-beads-80vw).

Which browser that is comes from ONE place: lib/browser-binaries.mjs (browserCandidates() / findBrowserBinary() — VOICEBOX_CHROME first, then the system paths, read at call time). The test driver, tools/page-acceptance.mjs and the phantom-turns case in tests/voicebox.test.mjs all ask it and pass the resolved path down; tests/browser-binaries-owner.test.mjs fails if a second candidate list (two or more browser-path literals in one file) or a second VOICEBOX_CHROME READ reappears — scanned across .mjs/.js/.cjs/.mts/.cts/.ts under the repository, excluding node_modules, .git, docs/ (prose), .beads/ (task state), workspace/ (a root the product writes) and the guard file itself (its own patterns and fixtures contain the strings it hunts for, bounded by a scanned-count assertion). That includes tests/, which the standing scripts/single-owner.mjs check deliberately does not scan — one of the three copies lived there, which is why nothing else could see it. A message that merely NAMES the variable is documentation, not a read (the same call single-owner.mjs makes for comments); public/verify.mjs is a named exemption for its own CHROME variable and single literal, and the guard speaks if it grows a list or reads VOICEBOX_CHROME (voicebox-beads-phs9).

5. The Scoped Fast Gate and its Coverage Record (--gate)

scripts/test-changed.mjs --gate is the repository’s own fast tier: the same changed-path selection the inner-loop runner uses, with the three differences that make its verdict quotable (voicebox-beads-zjpm.3, ADR voicebox-beads-zjpm.1).

node scripts/test-changed.mjs --gate                 # the fast gate for the branch's changed paths
node scripts/test-changed.mjs --gate --dry-run       # select and record, dispatch nothing
node scripts/test-changed.mjs --help                 # show accepted options, no git/test/manifest action
node scripts/gate-manifest.mjs verify <artifact>     # reconcile an artifact without re-running anything

It is the command a lane should point CHECK_FAST_CMD at. It is deliberately not a second orchestrator for the full suite: --gate-kind full exists so the same accounting can be applied to a merger’s union, and a full gate may not omit a classified file at all.

The blind spot for shared test infra, and its budget (voicebox-beads-55wl)

tests/lib/*.mjs is shared by most of the suite and imported mostly from the browser tier, so the fast gate proves almost nothing about an edit to it. Measured with the gate’s own mapper: tests/lib/cdp.mjs is reachable from 89 files of which 1 is in the unit lane, and tests/lib/server.mjs from 171 of which 24 — 14% of the harness every server test uses. The gate therefore said “tree is sound” about a change it could not see, and lanes hand-ran a browser subset on trust rather than ship unverified (two did, in one session).

scripts/infra-affected.mjs closes the selection half: for a change touching one of those helpers it picks a bounded, deterministic subset of the affected browser tests — the helper’s own name-prefixed tests first, then by name, at most INFRA_CAP (4) — and reports the tier’s whole blast radius alongside an affectedUnrun.browser record naming what it deliberately left. The cap is a constant, not a parameter, so a branch under test cannot enlarge the subset that verifies it. A change that does not touch shared infra returns applies: false and costs nothing, so no implementer is taxed for this.

Budget. The fast path is CHECK_FAST_CMD under a 180s bound, and the unit lane it runs today measures ~22s, so this class has roughly 150s of headroom. The selector itself costs the fast gate 0.6s (7 tests, 614ms, measured), and getting it there was the work: the obvious version imported scripts/test-changed.mjs (4.3s at import, because it builds the test inventory) and each mapToTests call costs ~2.3s with no cache, which added 13s to a 22s lane. The subset run’s own wall time is measured from the runner that executes it; the cap exists so that it stays inside this bound rather than being discovered to exceed it in the queue.

Precondition, not a preference: the accounting travels with the run - and the mechanism already exists. Verified against gate-recover’s fleet/zjpm6-host-context: scripts/gate-manifest.mjs’s SELECTION already includes not-selected, and recordFile refuses an omitted file with no reason, so recording each skipped affected file as not-selected with a reason is both the honest accounting and a manifest-level enforcement of it. The skipped files need no new field. The aggregate record does: a per-tier entry naming the subset and its counts is additive, i.e. a manifest v3 bump inside the same combined change (v2 is spent on the host block), with affected_not_run deriving from the file records’ own selection/dispatch and a disagreeing count refused by name. What does need building is the count at the reader: verdictOf returns pass when every dispatched file passed, and an omitted file is never dispatched, so five green out of sixty affected reconciles and reads pass unless the reader’s own line prints what was left. A verdict that cannot see an omission is the silence-reads-as-completeness trap with extra steps, so the subset mode does not run until that line exists.

The coverage contract for a page-loaded module (voicebox-beads-buy8)

.fleet/coverage-contract.json declares, per source path, the suites that exercise it. It exists because the fleet’s independent coverage oracle cannot see a module the page loads: ~/fleet/remote/check-coverage.py (find_candidate_tests_for_file) looks for a candidate suite by import/require/subprocess reference or by filename stem, and public/fused.js — the UI monolith, loaded by public/index.html as <script type="module" src="fused.js"> — is neither imported nor named after any suite. The oracle therefore found zero candidates for it and published coverage: PARTIAL, unmapped: ["public/fused.js"] on a run whose own manifest recorded 159 dispatched, 0 unmapped (voicebox-beads-zjpm.3).

The contract is the mechanism the oracle already supports for exactly this case (fleet-1n0z mode b); no fleet tooling change is involved. Its rule is the reason it is trustworthy: every suite it names must be dispatched, or the record is PARTIAL again — a suite that has stopped covering the file is named, not ignored. The witnesses here are the suites the changed-path map dispatches for public/fused.js that drive it directly: the browser suites that serve the real page (which loads the module) plus tests/served-vs-disk.test.mjs, which asserts the served copy of every module reference matches disk.

Measured 2026-10-14 against the real fast-gate log for tree 7a5e9157 (fast-gate markers for 159 suites):

contract oracle verdict
as committed coverage: KNOWN, unmapped: [], omitted: []
removed coverage: PARTIAL, unmapped: ["public/fused.js"] — the reported defect
one witness replaced by a suite that never ran coverage: PARTIAL, unmapped: ["public/fused.js"], omitted: ["tests/a-suite-that-never-ran.test.mjs"]

The artifact

~/.fleet/checks/<tree>.<fast|full>.manifest.json (override with --manifest-dir or VOICEBOX_GATE_ARTIFACT_DIR), written atomically and keyed by the tree SHA it describes, the gate kind, and a roster hash over the classifier’s (file, tier, why) output. tree_dirty records that the artifact was produced over uncommitted bytes, so a dirty run cannot be quoted as if it were clean — and on a full (landing) gate it is a refusal rather than a note: only the fast gate marks a dirty run and continues, because that is the gate you run on work you have not committed yet.

Every classified file is accounted for exactly once: dispatched (with its terminal status, counts, duration and timeout) or omitted by name with a reason (fast-only: not selected by the changed-path map).

Every record also states WHY it was selected, and the aggregator never supplies that reason: changed (the test file itself changed), dependency (a changed source maps to it), full-roster (the whole roster was the scope) or not-selected (the changed-path map did not pick it — the honest value for the files a fast gate omits). A record with no selection reason is a refusal, not a default. It used to fall through entry.selection ?? "changed", which was the one value a fast gate could least often support: measured on this branch, a gate over 9 changed paths recorded all 223 classified files as directly changed, contradicting the manifest’s own changed list (voicebox-beads-zjpm.3).

scripts/gate-manifest.mjs reconciles the artifact and refuses, naming each problem, on:

refusal what it catches
duplicate / unclassified / missing path a file recorded twice, recorded but not in the roster, or neither dispatched nor omitted
malformed tier / status / marker a tier that disagrees with the classifier, a non-terminal status, a missing counts block
lost child dispatched with no duration — the exit was lost, which is not a verdict
zero-test result a passing run that reported zero tests: an empty run demonstrates nothing
contradictory counts a passing record whose own counts carry failures
omission without a reason an unexplained gap in scope
full-gate omission any omitted file in a --gate-kind full run
unmapped source a changed source file that maps to no test

The artifact’s verdict

verdict is one of pass (every dispatched file finished green), fail, refused (an unmapped changed source or an unclassified mapped test), empty (nothing was dispatched — a run that measured nothing, which is never called a pass) or dry-run. The reconciled summary carries classified, recorded, dispatched, omitted, skipped, passed, failed, timeout, unknown, unmapped and problems, so “0 dispatched” is visible in the artifact itself rather than only in the log’s absence of a green line.

verdictOf(manifest) is the one answer to “what does this manifest mean” — refused when it does not reconcile, fail when any dispatched file is not passed (timeout and unknown included), empty when nothing was dispatched, else pass. It is exported for every orchestrator that folds records, so the “an unfinished file is not a pass” half cannot be re-derived differently by a second caller.

The markers the hub reads

Every dispatched file prints, at line start, a marker from the vocabulary fleet-check’s coverage extractor matches:

fast-gate: passed:  tests/<file>      # or failed:, or unknown: with the reason
fast-gate: unmapped: <changed file>   # a changed path the gate could not map
fast-gate: unknown: <reason>          # emitted whenever the run is incomplete

Only TERMINAL markers are published, and running: deliberately is not. The hub’s extractor unions every marker it matches — running included — into the set of suites it believes ran, so a running: line for a file that was later killed is read as coverage, and a killed process cannot retract it. Measured on a real stopped run (19 selected files, stopped part-way): the extractor answered coverage: KNOWN, indeterminate: false and listed the file that had only ever been printed as running. Progress is therefore a plain log line ([test:changed] running tests/<file>); a file appears in the marker vocabulary only once it has a terminal status, and an unfinished dispatch is a gap the hub reports as uncovered rather than as a suite that ran.

tools/browser-shard-runner.mjs emits the same per-file markers for the full gate’s browser tier, and with VOICEBOX_GATE_TIER_RECORD=<path> writes a tier record (what that tier dispatched) which the one aggregator folds in with recordTier. A tier never writes a manifest of its own: a partial manifest that happens to reconcile is a wide claim from a narrow run. Because running: is also read as evidence that a file executed, unknown: is emitted together with any incomplete run — that is what makes the hub report the run’s coverage as UNKNOWN (fail-closed) instead of counting a killed file as covered.

The live tier’s phases, and the union receipt

tools/browser-shard-runner.mjs can be invoked once for the whole browser lane, or PHASED so a supervisor runs the parallel queue beside the server pool and the isolated files afterwards on an otherwise idle box:

node tools/browser-shard-runner.mjs                    # whole lane: parallel queue, then ISOLATED alone
node tools/browser-shard-runner.mjs --parallel-only    # just the parallel slice
node tools/browser-shard-runner.mjs --isolated-only    # just the ISOLATED slice, one at a time

Each invocation asserts its own slice covers exactly once, and splitQueue (scripts/test-shards.mjs) owns the partition, so the two slices together are the lane — held by tests/test-shards.test.mjs. The two flags are mutually exclusive, and the per-file terminal markers and count lines are unchanged. With VOICEBOX_GATE_TIER_RECORD=<path> a PHASED run writes <path>.parallel.json / <path>.isolated.json, so a second invocation can never overwrite the first’s record.

Because the tiers are separate processes, no single runner can assert the gate’s scope: the receipt is the FOLD, and scripts/gate-manifest.mjs aggregate is its one implementation.

node scripts/gate-manifest.mjs aggregate --gate full --tree <tree-sha> --out <dir> \
  --record <tier-a.json> --record <tier-b.json> ...

# what scripts/pre-push.sh runs: the records the three tiers wrote, and the changed set to check against
node scripts/gate-manifest.mjs aggregate --gate full --tree <tree-sha> --tier-dir <scratch> \
  --changed-base origin/main

It builds the roster from the classifier, folds every tier record, refuses (non-zero, with the file named) a file no tier recorded, a file two tiers both recorded, a path no tier knows, and any omission in a full gate — and writes one manifest with the verdict. A deliberately narrower gate passes --omitted-reason so its unselected files are accounted for by name rather than left missing.

--tier-dir <scratch> is the form the full gate uses: it reads <scratch>/unit.json, <scratch>/server.json and <scratch>/browser.json — one record per tier, in the directory scripts/pre-push.sh owns for that run, named by tierRecordPath so the writer and the reader cannot disagree. A tier that wrote NOTHING is refused by name (the browser tier wrote no record at …), because a missing process and a tier whose every file failed are different facts and the reader of a red landing needs the first one. The artifact records that refusal ON DISK, not only on stdout: a run the fold refuses is rewritten as reconciled: false, verdict: refused — an earlier version left the pass it had written before the caller’s own problems were known, which is a receipt contradicting the gate that produced it. --changed-base <ref> records the changed set (<ref>...HEAD), records the ref itself as base, and refuses a changed source file that maps to no test, asked of the mapping’s owner through its own --json CLI; that refusal is the same one the fast gate makes, over the union being landed. The base must name a commit: the mapping’s --json developer path answers a base it cannot resolve with an empty change set and exit 0 (git’s ambiguous argument goes to stderr), so the fold resolves the ref first and refuses when it does not — unknown scope is not empty scope. The whole check is off when no base is named, so an aggregate over JSON records behaves as it always did.

The wiring is held by tests rather than by this paragraph: tests/gate-tier.test.mjs drives the tier runner and the fold (including a dropped file, a duplicate, a zero-test pass, a missing tier record and a failed file, each refused by name), and tests/pre-push.test.mjs drives the real gate in a disposable repository and asserts that a green run seals ONE <tree>.full.manifest.json accounting for all three lanes while a red tier seals none.

Acceptance is per phase

npm run accept prints a verdict per phase. When the shared front could not be witnessed, phase A is reported UNKNOWN for the shared front and the run ends ALL CLEAR (PHASE B ONLY) with the statement that the shared front was not verified: green code tests and an approved phase-B-only posture may coexist, but no reader (or gate log) may quote that run as having measured the served front.