Session 0037.0 — Transcript

App: human-experience-filter-art Start: 2026-06-30T10-42 (PST) Type: planning-and-executing Posture: yolo Claude-Session: aa7ac424-d797-4918-8837-2a904441d91e Checkout: /Users/benstull/git/benstull.org/benstull/human-experience-filter-art/.claude/worktrees/session-0037-altitude-snap-on-release End: 2026-06-30T10-52 (PST) Status: FINALIZED.

Summary

Single-task UX session. Made the altitude dial snap to the closest altitude on drag release so a grab-and-release always lands on a discrete altitude, just like a tap/label-click.

Arc

Claimed session 0037 (two stale --INPROGRESS placeholders 0015/0017 noted, not live). Worked in an isolated worktree (session-0037-altitude-snap-on-release) branched off origin/main (local main was 7 behind).
Located the behavior: onDialUp (simulator/static/app.js) held the live blend wherever a real turn stopped — the "no auto-complete" continuous-encoder model. Tap path (moved < 6 → jumpToScale) and wheel/label auto-scrub were already snap-to-altitude.
TDD: added an altitude-lock.spec.ts e2e ("releasing a partial drag snaps to the closest altitude") — confirmed RED (held pos never became integer).
Implemented: a real turn (moved >= 6) now autoScrub(Math.round(pos)) → short scrub to the nearest altitude, settle + lock (frac 0). Reduced motion is handled inside autoScrub (jump-to-target). GREEN.
Verified: full altitude-lock (14) + a11y + i18n e2e suites green. Committed, pushed, opened PR #31, merged to main (5696b94).

Pipeline (§9)

This app is exempt from flotilla/PPE/§9 prod gate — public target is static Cloudflare (Pages + R2). Change is merged to main; operator redeploy of the static build is the remaining ship step. No plan artifact archived: the change was a trivial leaf task, planned inline (no separate plan file; app has no content repo).

Next session

Operator by-eye review of the snap feel on the live sim, then redeploy to Cloudflare.

Launch prompt

When the user is dragging the slider (rather than clicking on an altitude), let's transition to the closest altitude when they let go. That way, the user will always land on an altitude as if they clicked one, even if they're grabbing and releasing the slider.

Plan

Anchor: leaf task (UX behavior tweak — directly plan-eligible, R2b).

Snap-on-release for the altitude dial. Today onDialUp (app.js) holds the live blend wherever a drag stops (the "no auto-complete" continuous-encoder model). Change: after a real turn (moved >= 6), autoScrub(Math.round(pos)) so the knob settles on the CLOSEST altitude (frac 0 → lock), identical to a tap/click. Tap path (moved < 6 → jumpToScale) unchanged. Reduced-motion is handled by autoScrub (jump-to-target, no tween).

Verification: new e2e in altitude-lock.spec.ts ("releasing a partial drag snaps to the closest altitude") — TDD red→green; full altitude-lock (14) + a11y

i18n suites green. Project is exempt from §9/PPE (static Cloudflare target); ships branch → PR → merge → operator redeploy.

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.

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