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feat(audio): implement phase 3c master protection

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Labyricorn
2026-09-05 20:45:47 -07:00
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docs/IMPLEMENTATION_STATUS.md
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# XZBT implementation status
**Updated:** September 5, 2026
**State:** Phase 3c slices 1–3 complete; stopped at the user-requested slice-3 checkpoint. Master protection (slice 4), the Phase 3 audible gates, and the Phase 1 direct-file import/restart observation remain pending
**State:** Phase 3c slices 1–3 complete; slice 4 master protection implemented and automatically verified. Slice 4 hardware measurement/listening acceptance, the Phase 3 audible gates, and the Phase 1 direct-file import/restart observation remain pending
**Planning baseline:** `05fe2b4e021ba86e4a290d05b63c7cae0e386128`
**Exact demarcation:** GC1 direct-file feasibility (10/10 checks), GC2 shared format contracts, GC3 resolution semantics, GC4 clock/PRNG semantics, and GC5 ownership/failure semantics are complete at the Phase 0 contract-oracle level. The Phase 1 production runtime skeleton, Phase 2 common grammar, and audio engine through Phase 3c slice 3 pass automated checks. Phase 1's direct-file two-fixture restart observation, Phase 3's audible acceptance (no sound has been heard from a production build), and measured master protection remain open. Visual, cadence/event, scenario, final generated-UI, performance, and soak work remains assigned to later phases.
**Exact demarcation:** GC1 direct-file feasibility (10/10 checks), GC2 shared format contracts, GC3 resolution semantics, GC4 clock/PRNG semantics, and GC5 ownership/failure semantics are complete at the Phase 0 contract-oracle level. The Phase 1 production runtime skeleton, Phase 2 common grammar, and audio engine through Phase 3c slice 4's implementation pass automated checks. Phase 1's direct-file two-fixture restart observation, Phase 3's audible acceptance (no sound has been heard from a production build), and real-browser measured master protection remain open. Visual, cadence/event, scenario, final generated-UI, performance, and soak work remains assigned to later phases.
The user requested sequential implementation with a stop on problems. The [manual version 3 evidence](evidence/phase0/2026-09-04-user-run-v3.md) verifies embedded data-URL worklet loading in direct-file Chrome. The subsequent [user-performed restart test](evidence/phase0/2026-09-04-user-restart.md) restored Blue Study activity 0.37 and master volume 0.19 immediately on reopening. Native tone output and AudioContext suspend/resume are also observed. Ordinary file import, selection of both exhibits, regular Chrome mode, and [directory cancellation/denial fallback](evidence/phase0/2026-09-05-user-directory-fallback.md) have been confirmed.
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| 0 — Contracts and feasibility | Complete | GC1 passed; GC2–GC5 shared contracts and traces passed; GC6/GC7 later gates scheduled and mapped |
| 1 — Runtime skeleton | Implemented; acceptance pending | [Automated evidence](evidence/phase1/2026-09-05-runtime-skeleton.md) passes production-module, lifecycle, PRNG-vector, cache/restore, fixture-validation, and deterministic-build tests. Direct-file two-fixture import/restart remains a user-observed gate. |
| 2 — Common grammar | Complete | [Automated evidence](evidence/phase2/2026-09-05-common-grammar.md) covers production GC2 conformance, typed values, signals, actions, same-tick bindings, transitions, override precedence/release, and parameter restoration. |
| 3 — Audio engine | Slices 3c-1 (contract), 3c-2 (lifecycle/voices), and 3c-3 (automation) complete; stopped before slice 4 | [Audio authoring evidence](evidence/phase3/2026-09-05-audio-authoring-contract.md), [contract evidence](evidence/phase3/2026-09-05-phase3c-contract.md), [lifecycle/voice evidence](evidence/phase3/2026-09-05-phase3c-lifecycle-voices.md), and [automation evidence](evidence/phase3/2026-09-05-phase3c-automation.md). Slice 4 requires measured master protection and user listening; PRD 129 and real GC4 audio acceptance remain open. |
| 3 — Audio engine | Slices 3c-1–3 complete; 3c-4 implementation verified, user acceptance pending | [Contract](evidence/phase3/2026-09-05-phase3c-contract.md), [lifecycle/voices](evidence/phase3/2026-09-05-phase3c-lifecycle-voices.md), [automation](evidence/phase3/2026-09-05-phase3c-automation.md), and [protection evidence](evidence/phase3/2026-09-05-phase3c-protection.md). Slice 4 requires real-browser measurement and user listening; PRD 129 and real GC4 audio acceptance remain open. |
| 4 — Visual engine | Not started | Earlier phases and visual contracts |
| 5 — Events and cadence | Not started | Earlier phases and event/cadence contracts |
| 6 — Scenario director | Not started | Earlier phases and scenario contracts |
@@ -63,7 +63,7 @@ At the Phase 3a/3b checkpoint, automation, lifecycle/voices, and measured protec
## Phase 3c contract (slice 1)
Format Specification section 16 completes the audio subsystem contract. Phase 3c is delivered in four slices, recorded in the implementation plan: the contract (done), lifecycle and voices (done), automation (done), and measured master protection (pending). Each slice ends green and committable.
Format Specification section 16 completes the audio subsystem contract. Phase 3c is delivered in four slices, recorded in the implementation plan: the contract (done), lifecycle and voices (done), automation (done), and measured master protection (implementation done; user acceptance pending). Each slice ends green and committable.
Section 16 was contract only at slice 1.
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`npm test` passes **88 tests**, including 21 new slice-3 tests. The self-contained build is deterministic; the artifact digest is `6aa1b659e1f06ca3175ac62a4544cc3342e8731f6d6f186c68fcd667cf683d97`. See the [slice-3 evidence](evidence/phase3/2026-09-05-phase3c-automation.md) for exact coverage, scheduling precision, and the test boundary.
**Stop:** Slice 3 is complete; wait for the user before starting slice 4. The master chain is unchanged. Measured protection, audible acceptance, and real GC4 synchronization are not claimed by the automated tests.
**Historical checkpoint:** Slice 3 ended with the master chain unchanged. The user subsequently authorized slice 4, recorded below.
## Phase 3c master protection (slice 4)
The placeholder compressor is replaced by an embedded AudioWorklet with stereo-linked lookahead limiting, a final sample clamp, and per-instance finite-sample guards. Every bus and master-volume gain precedes final protection. Nonfinite input mutes the complete mixed block and raises one warning per instance; measurement records repeat affected blocks. Initialization fails closed when protection is unavailable, and disposal owns all worklet nodes and ports.
`npm test` passes **102 tests**, including 14 slice-4 tests. Production and acceptance builds are deterministic and self-contained. The [protection evidence](evidence/phase3/2026-09-05-phase3c-protection.md) records coverage and limits. A [standalone user-run page](../prototypes/phase3/XZBT-audio-acceptance.html) provides a frozen overlap workload, exact audio-frame capture, twelve challenge recipes and JSON export; see [run instructions](../prototypes/phase3/README.md).
**Acceptance checkpoint:** Implementation is ready for user testing. The candidate −1 dBFS ceiling, 0.1 dB tolerance and audible release behavior remain provisional. No production audio has been heard or measured; traces 15–17, PRD 129, reference-exhibit listening and real GC4 synchronization remain open. Phase 3 is not accepted, and later phases have not started.