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docs: record the phase 6 scenario evidence and status

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Add the Phase 6 evidence record, update the implementation status,
verification gates, gap-closure decisions, implementation plan and README
for the scenario director, and state plainly that Phase 6 is not accepted
until its two-hour real-duration soak is observed.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01M7dgfQ12mpM4JjSMv3inLA
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Labyricorn
2026-09-06 22:54:40 +00:00
co-authored by Claude Opus 5
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commit f60b3b6442
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docs/IMPLEMENTATION_STATUS.md
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# XZBT implementation status
**Updated:** September 6, 2026
**State:** Phase 3 audio engine implemented through slice 3c-4 and automatically verified; Phase 4 visual implementation is complete through 4g, with automated verification and a standalone visual challenge page; Phase 5 Events and Cadence implemented and verified across all 14 traces and reference exhibits A–D. The Phase 4d–4g and Phase 5 review triages ([reviews/02-triage.md](../reviews/02-triage.md), [reviews/03-phase5-triage.md](../reviews/03-phase5-triage.md)) have been worked through: every Tier-1 finding is fixed and covered by a test on the production code path, and the residual items are tracked in [reviews/04-followup-debt.md](../reviews/04-followup-debt.md). Slices 3c-4/4h hardware measurement/listening acceptance and Phase 1 direct-file import/restart observation remain pending; Phase 6 (scenario director) is unblocked
**State:** Phase 6 scenario implementation and automated acceptance complete: section 21 contract, seven triggers, timelines/repeats/branches, admission/concurrency, nested ownership, bounded cleanup, Exhibit E, A/B overrides and acceptance tooling. **252 automated checks pass. The required two-hour real-duration development soak remains pending**, as do earlier direct-file, audio/listening and Phase 4h hardware gates. Phase 6 is not fully accepted until its soak evidence is recorded.
**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, audio engine through Phase 3c slice 4's implementation, visual engine through 4g, and Phase 5 Events and Cadence 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. The visual subsystem contract is complete at Phase 4a-4c and its aggregate ceilings are provisional pending the slice 4h GC6 measurement; visual implementation through 4g is present; scenario director, final generated-UI, measured performance, and soak work remain 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, audio engine through Phase 3c slice 4's implementation, visual engine through 4g, and Phase 5 Events and Cadence 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. The visual subsystem contract is complete at Phase 4a-4c and its aggregate ceilings are provisional pending the slice 4h GC6 measurement; visual implementation through 4g is present; the scenario director is now implemented (section below); final generated UI, measured performance, and real-duration soak acceptance remain open.
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.
@@ -16,7 +16,7 @@ The user requested sequential implementation with a stop on problems. The [manua
| 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 | Implemented through 4g; user acceptance pending | [4e procedural evidence](evidence/phase4/2026-09-06-phase4e-procedural.md), [4f execution evidence](evidence/phase4/2026-09-06-phase4f-execution.md), [4g fixtures](evidence/phase4/2026-09-06-phase4g-challenges.md). Fourteen challenge fixtures and first visuals for A–D execute without subject-specific renderer code. Slice 4h and PRD 130 display judgment remain open. |
| 5 — Events and cadence | Complete | [Automated evidence](evidence/phase5/2026-09-06-phase5-events-cadence.md) covers contract Section 20, schema/validation with static cycle detection, 1024-action budget, 16-level nesting, priority cadence clocks, minGap, recency relaxation, ambient voices, and manual SAMPLE PRNG isolation. |
| 6 — Scenario director | Not started | Earlier phases and scenario contracts |
| 6 — Scenario director | Implemented; real-duration soak pending | [Phase 6 evidence](evidence/phase6/2026-09-06-scenario-director.md), 21 scenario tests, reproducible forty-minute Exhibit E, production GC5 counters; [acceptance instructions](../prototypes/phase6/README.md). |
| 7 — Dynamic UI | Not started | Earlier phases and UI contracts |
| 8 — Library and persistence hardening | Not started | Earlier phases and library contracts |
| 9 — Reference suite completion/audit | Not started | Earlier phases, challenge coverage, benchmark and soak evidence |
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Format Specification revision 0.9 adds Section 20, completing the Cadence and Event subsystems contract with 14 acceptance traces. The JSON Schema and semantic validator enforce DAG event cycle detection (`ERR_CYCLIC_DEPENDENCY`), cadence clock range ordering (`ERR_INVALID_RANGE_ORDER`), and sound cadence metadata. The Action Model enforces the 1024-unit/tick dispatch budget (`ERR_DISPATCH_BUDGET`), 16-level event nesting depth limit, event parameter scoping and strict type validation (`ERR_TYPE_MISMATCH`, `ERR_UNKNOWN_FIELD`), and sound usage gating (`ERR_UNSUPPORTED_TARGET`). The CadenceSubsystem schedules four class clocks (`routine`, `intermittent`, `occasional`, `rare`), enforces the 1.5s minimum gap with class priority ordering, applies anti-repetition recency multipliers (`[0.0, 0.25, 0.50, 0.75]`) with pool relaxation on deadlock, maintains continuous ambient voices, and runs on an isolated PRNG stream (`cadence` domain). Exhibits A–D include complete audio buses, sound recipes, cadence clocks, and lifecycle events.
## Phase 6 scenario director
Format Specification revision 0.10, section 21, completes scenario shapes and semantics. The runtime executes all seven triggers, eligibility/cooldown, symmetric exclusivity, priority replacement/deferred ordering, absolute and random relative timing, lazy finite repeats, weighted branches, and bounded owner cleanup through production fixed ticks. Audio lifecycle disposal follows logical time when attached to a performance. Nested events preserve owner/usage/stream; both override scopes release on termination.
Twenty-one new tests include all GC5 trace categories with production resources, 24 repeated completion/cancellation/failure cycles, and two matching forty-minute Exhibit E runs. The full suite passes 252 checks. A/B now include audio/cadence and temporary activity overrides. The source fixture generator preserves these additions when rebuilding the visual acceptance page.
The self-contained scenario challenge/soak page includes a frozen v1 workload, runtime/workload hashes, frame distributions, counters, memory samples when available and exact worklet output capture. Localhost browser smoke checks establish interactive execution, not direct-file or hardware acceptance. The **two-hour real-duration development soak has not been run**; Phase 6 remains at that acceptance boundary. See [evidence](evidence/phase6/2026-09-06-scenario-director.md).