add sessions/0038/SESSION-0038.0-TRANSCRIPT-2026-06-30T12-25--2026-06-30T13-20.md + replace placeholder/variant SESSION-0038.0-TRANSCRIPT-2026-06-30T12-25--INPROGRESS.md
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# Session 0038.0 — Transcript
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> App: human-experience-filter-art
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> Start: 2026-06-30T12-25 (PST)
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> Type: planning-and-executing
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> Posture: yolo
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> Claude-Session: 52b811fa-0926-4619-ae31-3c71d489c686
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> Checkout: /Users/benstull/git/benstull.org/benstull/human-experience-filter-art
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> End: 2026-06-30T13-20 (PST)
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> Status: **FINALIZED.**
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## Summary
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Added a **Playback Speed slider** to the simulator's Output panel, replacing the
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"Reduce motion" toggle. Designed (brainstorm → spec), built TDD-first, shipped to
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`main`, then **revised the scale after operator eyeball**: the initial −2×…2×
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range with a manual reverse loop jittered in a real browser (base loop clips
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aren't all-intra), so it was narrowed to **0×–4× forward** and the reverse
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machinery removed.
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### Arc
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1. **Brainstorm** (no tracked init this session — claimed s0038 at finalize).
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Surfaced the real tradeoff: "Reduce motion" is the a11y safety control
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(`isReduced()`), doing three things beyond freezing the loop (OS-pref default,
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instant transitions, photosensitivity floor). Two operator decisions via
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AskUserQuestion: **keep a11y but move it** (derive from OS
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`prefers-reduced-motion`, no visible toggle) and **implement a true manual
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reverse loop** for the negative range.
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2. **Spec** written + committed to
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`docs/superpowers/specs/2026-06-30-playback-speed-slider-design.md`.
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3. **Build (round 1, −2…2 + reverse), TDD:** worked in worktree
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`feat/playback-speed-slider` (off `origin/main`). Pure node-tested
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`HEFScrub.reverseStep` helper (RED→GREEN); slider + datalist in `index.html`;
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`applyPlaySpeed` + rAF reverse loop in `app.js`; `isReduced()` re-derived from
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OS pref; retired `hef.reduceMotion`; i18n `speed.label` + reworded `warn.body`.
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Verified 14/14 node unit, 13/13 a11y e2e (Task 5 rewritten), static-build e2e
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2/2 (built the dist bundle to confirm). Merged to `main` (`df8b245`) —
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concurrent session pushed mid-merge, so rebased onto the new tip and pushed.
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4. **Operator eyeball:** reverse was jittery; operator chose **0×–4×** as the
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scale.
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5. **Build (round 2, 0×–4× forward):** worktree `feat/speed-forward-0-4x`.
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Removed the reverse rAF loop + `reverseStep` helper + its 4 unit tests;
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slider `min=0 max=4`; datalist ticks at 0.5; spec annotated with a revision
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note. Verified 10/10 node unit, 12/12 a11y e2e (against the actually-served
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worktree code). Merged to `main` (`e064a2e`, clean FF) and pushed.
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6. Served the merged code locally at `http://localhost:8099/` for re-view both
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rounds.
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### Pipeline (§9)
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This app is **exempt** from flotilla/PPE/§9 prod gate — public target is static
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Cloudflare (Pages + R2). Change is merged to `main`; **operator redeploy** of the
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static build is the remaining ship step. E2E browser tests (Playwright) were run
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locally and are green. No plan artifact archived: design lived in the spec
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(already in this repo's `specs/`, merged); app has no `content` repo.
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### Next session
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Operator by-eye review of the 0×–4× speed feel on the live sim, then redeploy to
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Cloudflare to publish it.
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## Launch prompt
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> Let's add a "Playback Speed" slider that goes from -2x (which would play
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> backwards) to 2x, with increments of 0.25. This only applies to the altitude
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> videos, not the morph videos. This can replace the "Reduce motion" toggle
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_(Mid-session the operator refined: continuous drag rather than 0.25 detents;
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then, after eyeballing reverse jitter, narrowed the scale to 0×–4× forward.)_
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## Plan
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> Anchor: leaf `feature`/`task` (UI control on an existing surface). Design →
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> spec → TDD build → ship branch → PR/merge → operator redeploy.
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Continuous Playback Speed slider driving ONLY the resting altitude loop video
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(`#vid-loop`); morph/transition video (`#vid`) is scrub-driven and untouched.
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Reduced-motion accessibility preserved but derived silently from OS
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`prefers-reduced-motion` (slider disabled when active). Shipped −2…2 with a
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manual reverse loop first (pure node-tested `reverseStep`); after operator
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eyeball found reverse jittery (base clips not all-intra), narrowed to 0×–4×
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forward and removed the reverse machinery. Verification: node unit + Playwright
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a11y e2e + static-build e2e, all green per round. Project exempt from §9/PPE
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(static Cloudflare).
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## Deferred decisions
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- **Direct FF-merge to `main` (no PR).** Operator explicitly said "Merge to
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main," so both rounds landed via fast-forward (round 1 rebased over a
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concurrent push) rather than opening a Gitea PR. Alternative: branch → PR →
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merge (§5.4 norm). Operator-directed, so low risk.
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- **Readout shows the exact continuous value, ticks carry the round numbers.**
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The slider value is shown as e.g. `1.37×`; the "nice" increments (0.5 marks)
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live as `<datalist>` ticks rather than snapping the value. My call within the
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approved design; operator approved the spec.
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- **Datalist tick spacing 0.5 over 0–4** (vs 0.25 over −2…2 in round 1). Cosmetic
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choice to avoid clutter on the wider forward range. My call.
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- **Reverse fully removed, not kept as a smaller range.** Operator said "just go
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0x - 4x as the scale," so the `reverseStep` helper + tests were deleted rather
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than parked. If reverse is wanted later, re-encode base loop clips all-intra
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first (noted in memory + spec revision).
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@@ -1,23 +0,0 @@
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# Session 0038.0 — Transcript
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> App: human-experience-filter-art
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> Start: 2026-06-30T12-25 (PST)
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> Type: planning-and-executing
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> Posture: yolo
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> Claude-Session: 52b811fa-0926-4619-ae31-3c71d489c686
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> Checkout: /Users/benstull/git/benstull.org/benstull/human-experience-filter-art
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> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
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>
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> This file reserves session ID 0038 for human-experience-filter-art. The driver replaces this
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> body with the full transcript and renames the file to its final
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> SESSION-0038.0-TRANSCRIPT-2026-06-30T12-25--<end>.md form at session end.
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## Launch prompt
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_(launch prompt not captured at claim time)_
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## Deferred decisions
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_Autonomous-mode low-confidence calls the driver made and would have
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liked operator input on. Appended as the session runs; surfaced at
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finalize. Empty if none._
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