Session 0028.0 — Transcript

App: human-experience-filter-art Start: 2026-06-30T06-53 (PST) Type: planning-and-executing Posture: yolo Claude-Session: d9da7994-e036-4b7c-b2d4-d2675ac4e5a1 Checkout: /Users/benstull/git/benstull.org/benstull/human-experience-filter-art Status: FINALIZED. Worktree: worktree-session-0028 (isolated; concurrent session in flight). Torn down at finalize. Outcome: D3 reverse-landing frame jump FIXED, app-side. PR #30 → main (582183d).

Launch prompt

/goal next — operator then directed: "There's a concurrent session — do this one out of a worktree in a different dir." Session 0028 runs isolated in worktree worktree-session-0028 while a concurrent session owns the simulator startup ("Run simulation" button: index.html/style.css/i18n.js).

Plan

Anchor: leaf bug — D3 reverse-landing frame jump (no tracker issue; the s0027 capture token returned 401. Residual flagged in the altitude-morph-and-scrub memory note + scrub-driven-transitions design.)

Goal: kill the ~3-second frame jump when ASCENDING the altitude dial and landing on the higher-altitude clip.

Root cause (verified by reading the bake + player): each baked morph transitions/{h}__{l}.mp4 spans src(h)@0s (frac 0) → dst(l)@~LOOP_TAIL_S (frac 1), and the scrub uses this single forward file in BOTH directions. The steady loop element always seeks to LOOP_TAIL_S (3.0s) on landing. So:

DESCEND (dir>0) lands on dst at frac 1 → morph ends dst@3 ≈ loop@3 → seamless ✓ (the s0026 "loop-from-tail" fix).
ASCEND (dir<0) lands on src at frac 0 → morph shows src@0, but loop seeks src@3 → ~3s jump ✗ (D3).

Fix (app-side, no media re-bake — beats re-baking 154 LFS morphs): make the loop landing frame DIRECTION-AWARE. On a reverse landing seek the loop to 0 (= the morph's frac-0 frame) and wrap [0,dur] (the base is already a seamless crossfade-loop); forward keeps [LOOP_TAIL_S,dur]. Pure decision extracted to scrub.js loopLandFrame(dir, loopTailS) + node tests; wired through loadLoop/settle/wrap handlers in app.js.

Tasks:

TDD HEFScrub.loopLandFrame(dir, loopTailS) in scrub.js (+ scrub.test.js).
Wire app.js: loadLoop(clip, landFrame), directional settle seek, dataset.loopStart in the timeupdate/ended wrap handlers.
Add a reverse-landing e2e (mirror of the existing forward "loops from tail" test).
Verify: node unit tests + pytest + e2e (best-effort) all green.
Branch → PR → merge (yolo). PPE/E2E machinery not built for this app (§10.6) — local green is the bar; prod promotion stays operator-gated.

Deferred decisions

Autonomous-mode low-confidence calls the driver made and would have liked operator input on. Appended as the session runs; surfaced at finalize. Empty if none.

Fix shape: app-side direction-aware loop landing, NOT a 154-morph re-bake. The s0026 memory note guessed the D3 fix would be "per-clip loop files." Reading the bake + player showed the root cause is simpler: the morph's frac-0 frame is src@0 but the loop always seeked the tail (LOOP_TAIL_S). Fixed entirely in app.js/scrub.js by landing the loop on the morph's actual frac-0 frame (0) when ascending. This avoids re-baking 154 LFS morphs (no media churn, a tiny reviewable diff, the base clips are already seamless crossfade-loops so [0,dur] wraps cleanly). Alternative considered: re-bake morphs to start at src@LOOP_TAIL_S — heavier, no benefit.
Pre-existing e2e failure left as-is: loop-recovery.spec.ts fails in this environment on the CLEAN baseline too (verified by stashing my changes). It boots without enabling video, so the loop's loopTail is never armed and the ended guard returns early. Not introduced here; my change preserves that guard exactly. Worth a separate look (the test likely needs to enableVideo first), but out of scope for D3.
Could not verify by eye. The fix is logic- and test-verified (node + the new reverse-landing e2e asserting the loop anchors at the head, not the tail); the actual visual seamlessness of an ascending landing still wants an operator eyeball in the running sim.

Session arc

Claimed session 0028 (race-free, via git). Two stale --INPROGRESS placeholders (0015, 0017) noted as orphaned, left untouched.
Baseline survey surfaced uncommitted run-sim button edits + main behind by 2 (session commits). Operator confirmed a concurrent session owns that startup work and directed isolation → created worktree worktree-session-0028 off origin/main, leaving the concurrent session's edits in the canonical clone untouched.
Orientation: in-repo docs/ROADMAP.md is stale (formal frontier = deferred hardware); live frontier is in memory. Stored /goal next (0027's by-eye annotation review) is operator-eyes work I can't complete; the run-sim button is the concurrent session's. Asked the operator to pick 0028's disjoint item → D3 reverse-landing fix.
Read the bake (build_pool_manifest.transition_cmd) + player (app.js loop/morph) to pin the root cause (morph spans src@0→dst@tail; loop always seeks the tail).
TDD: HEFScrub.loopLandFrame (red → green), then wired app.js (loadLoop(clip,landFrame), dataset.loopStart, directional settle, wrap handlers).
Added a reverse-landing e2e. Verified: node 16/16, altitude-lock e2e 12/12 (forward no-regression + new reverse test), pytest 299 pass. Confirmed loop-recovery.spec.ts fails on the clean baseline too (pre-existing, not mine) by stashing.
Committed → PR #30 → merged to main (582183d) → deleted branch. Updated memory.

Cut state

On main (582183d): D3 fix — simulator/static/scrub.js (+loopLandFrame), simulator/static/app.js (direction-aware loop landing), simulator/unit/scrub.test.js, simulator/e2e/tests/altitude-lock.spec.ts (reverse-landing test).
Tests: node 16/16; altitude-lock e2e 12/12; pytest 299 pass / 3 pre-existing env-only failures (real-ffprobe/ffmpeg + ML detect; untouched — no Python changed) / 4 skipped. loop-recovery.spec.ts is a pre-existing baseline failure in this env.
§9 / deploy: this whole project is exempt from flotilla/PPE/§9 (memory: project-exempt-from-wiggleverse-deploy; public target is static Cloudflare). Local-green is the bar — met. No PPE stage to run.
No plan artifact archived: fused leaf fix, plan inline in this transcript; app has no content repo (CONTENT_REMOTE empty) — nothing to archive.

Operator plate

Review by eye an ASCENDING altitude landing in the running sim — confirm the ~3s reverse-landing jump is gone (logic/test-verified only; no Chrome on box here).
Still standing from s0027: by-eye review of the 28 left-brain annotations (4 langs); decide on tracked labels for abyss/reef creature clips.
A concurrent session was shipping the "Run simulation" startup button — reconcile/land that separately (its edits are in the canonical clone, not touched here).

Next-session prompt

/goal Review by eye in the running simulator: (1) an ASCENDING altitude landing — confirm the D3 reverse-landing frame jump is gone; (2) the 28 left-brain annotations across en/es/fr/ja, correcting any species/box that reads wrong; then decide whether the abyss/reef creature clips should get tracked labels via author mode.

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