Session 0020.0 — Transcript

App: human-experience-filter-art Start: 2026-06-26T06-47 (PST) End: 2026-06-26T07-58 (PST) Type: writing-plans (extended into execution — operator approved "then build it" at the plan gate) Posture: careful (execution proceeded under explicit operator approval) Claude-Session: e0cc053a-41fa-416d-a4f5-493f14984e75 Anchor: design docs/superpowers/specs/2026-06-26-audio-video-separated-controls-design.md (R2a) Status: FINALIZED

Launch prompt

Write the implementation plan for the "Audio + Video — separated Visual & Audio controls" feature, then build it. (Spec: docs/superpowers/specs/2026-06-26-audio-video-separated-controls-design.md.) Split the bundled 7-way Content selector into orthogonal Visual (on/off) × Audio (off / soundtrack / white noise). Audio follows the single Altitude dial; white noise synthesized (ffmpeg anoisesrc). Reframe the (unbuilt) networked- control-surface spec §3/§5 as a clean pre-implementation edit. Honor the testing tiers; resolve the three §12 flagged decisions.

Pre-state

main clean at 99a751c. Two stale --INPROGRESS placeholders (0015, 0017) from 2026-06-24/25 — prior dead sessions, not live; left untouched.
The networked-control-surface architecture (SSE / /remote / renderer split) was unbuilt — the sim is a single fused page (simulator/static/index.html) talking to FastAPI via POST /api/alteration (knobs) + POST /api/ring/advance (altitude).
Audio assets (5 sourced ambiences) sat gitignored under simulator/sample_media/audio/<scale>/, unreferenced by the manifest, unserved; no <audio> element anywhere; video muted.

Session arc (turn by turn)

Session gate → writing-plans. Classified the two-part "write the plan, then build it" prompt as the build track's entry; claimed session 0020 (--type writing-plans, careful posture). Baseline clean; created branch session-0020.
Scoping. Read both specs + the audio candidate pool; dispatched an Explore agent to map the current simulator. Key finding: the control-surface architecture is unbuilt, so the audio spec's §6 server contract had no host. Resolved by the standing simulator-first directive: build the audio feature into the current single-page sim (ships sound now); reframe the control-surface spec on paper only; do NOT build the SSE//remote/renderer split (it's "v1 hardware," deferred). This build is the "Content step" the audio spec §11 anticipates.
Plan. Wrote docs/superpowers/plans/2026-06-26-audio-video-separated-controls.md (10 tasks, all testing tiers). Committed + pushed; presented at the careful-posture plan gate. Operator answered "Approve — build it." §12 decisions resolved: audio=live (~0.6 s crossfade), noise=pink, autoplay=tap-to-start overlay; asset params −18 LUFS / mp3 / loop mirrors the proven video crossfade recipe.
Build (TDD, commit per task):
- T1–2: pure ffmpeg audio builders (tools/pipeline/audio_ops.py) + runner (audio_run.py) + simulator/build_audio_media.py; produced the 5 normalized loops + pink-noise bed (gitignored).
- T3: Scale.audio manifest field + read/emit/serialize + SCALE_AUDIO; manifest regenerated (clean diff — only 5 audio lines).
- T4–6: pure player/audio.py resolver; retired player/content.py (+ test); reframed player/controls.py + player/state.py; /api/alteration validates visual+audio and returns render.video + server-resolved render.audio.url from altitude_index. Full Python suite green.
- T7–8: client — Content <select> → Visual toggle + Audio selector; A/B <audio> gain-crossfade layer; tap-to-start gesture. Smoke-tested page + media (200s).
- T9: reframed the networked-control-surface spec §3/§4/§5/§6; recorded §12 resolutions; ROADMAP note.
- T10: Playwright E2E ([e2e] extra). Installed Chromium and ran it for real — surfaced + fixed three client issues (see Cut state). 3 E2E pass, full suite 288 passed, 2 skipped.
Verify + ship. Screenshotted the running app (cosmos plays, soundtrack audibly playing cosmos/pillars.loop.mp3, split controls visible, zero JS errors). Merged session-0020 → main (--no-ff) and pushed. (gh PR create denied — Gitea host; merged locally with branch→merge discipline.)

Deferred decisions

No low-confidence autonomous calls. The scope decision (current-sim vs full control surface) was approved at the plan gate; the three §12 resolutions were operator- delegated by the launch prompt ("resolve the three flagged decisions"); asset params (−18 LUFS, mp3, pink) follow the spec's stated direction.

Cut state

main @ aa76cd1 (merge of session-0020), clean, synced with origin.
288 tests + 3 Playwright E2E pass; 2 skipped (opt-in media integration).
Three client robustness fixes the E2E drove out (worth remembering):
- fadeVolume uses setInterval, not requestAnimationFrame (rAF stalls when the tab is backgrounded → the gain ramp hung in headless).
- The start gesture drops per-element "priming": a single page click grants Chrome autoplay document-wide; priming srcless <audio> only hung the handler / polluted the paused-state.
- applyAudio does not await play() (awaiting a srcless/buffering play can hang).
Plan archival: this app has no content repo (CONTENT_REMOTE empty), so the plan was not archived to a plans/ collection — it lives in-repo at docs/superpowers/plans/ and is already on main.
§9 pipeline: localhost + E2E stage is green; there is no PPE/prod infra for this simulator-first art app (deferred with the Pi renderer), so no further ship stage ran.

Operator plate (what's true now / next)

The simulator has sound: per-altitude soundtracks that follow the Altitude dial + a pink white-noise bed, behind orthogonal Visual × Audio controls. The unheard audio wants a by-ear review/tune.
Deferred (already roadmap-tracked, not re-parked in memory): the music layer (reserved Audio position, no assets), the networked-control-surface SSE//remote build, i2v ring transitions, the Pi renderer.

Next /goal

/goal review/tune the new audio by ear in the sim (per-altitude soundtracks + pink white-noise + the ~0.6s A/B crossfade; tap-to-start), then source/compose the deferred per-altitude music layer (the reserved Audio position), per docs/audio-candidate-pool.md

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