[laneB] log: M1 session 1

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

logs/laneB.md

@@ -8,4 +8,54 @@ Format per session:
     BLOCKED/REQUESTS: …
     NEXT: …
 
-(no sessions yet)
+## 2026-07-18 session 1
+DONE: M1 complete. All files under `scenegod/web/`.
+  - `timeline.js` — model + clock, no DOM, no three import (self-contained
+    quat/euler/slerp math so `node` can run it). `load/toJSON` lossless
+    round-trip (unknown entity fields preserved via structuredClone + a
+    WeakMap for cached quats). `evaluate(t)`: transform (pos/scale lerp, rot
+    slerp→euler, easing incl. step-hold), params (num lerp, color sRGB lerp),
+    clip blocks (set-time exact scrubbing, fade-out ramp), camera cuts (fires
+    only on change). Clock: `play()` rAF deltas, `seek` clamp, `step(frame)`
+    pure/deterministic for Lane C render. Mutators addKey/moveKey/deleteKey/
+    addClipBlock/moveClipBlock/trimClipBlock/addCut + undo stack (`undo()`
+    wired; Ctrl+Z hooked in tlui). `capturekey` window listener present.
+    Clips need `await tl.preload()` before evaluate (prepareClip is async).
+  - `tlui.js` — canvas panel into `#timeline`. Ruler scrub, drag playhead,
+    space=play/pause, dblclick lane=add key from stage state, drag key (snap
+    to frame, Alt=free), right-click=delete, drag clip block/edge, Home/End,
+    Ctrl+Z. Scene bar name/dur + Save/Load (POST/GET `/scenes/{name}`,
+    localStorage fallback). Names column auto-syncs to `stage.entities()` via
+    `onChange`.
+  - `stagestub.js` — full §4.2 Stage as plain objects; records effects into
+    `stage.applied[]`. Dev-only, delete at SYNC 1.
+  - `timeline_test.mjs` — `node scenegod/web/timeline_test.mjs` → green
+    (midpoint interp, step-ease hold, clip local time @3 frames, camera flip,
+    lossless round-trip, unknown-field preservation).
+  - `tldev.html` — dev-only browser harness. Verified in browser: scrub moves
+    entities (interp live in log), play runs to duration + auto-stops, camera
+    cut flips camA→camB at t=3, keys/clips/cuts render. Delete at SYNC 1.
+DECISIONS:
+  - Timeline imports NO three.js — inlined euler↔quat + slerp (~30 lines) so
+    the node self-check needs zero deps (there is no node_modules/three in
+    this stack). setTransform rot is euler (matches entityTransform format).
+  - One `<canvas>` for all lanes (not canvas-per-lane); hit-testing via a
+    hitbox list rebuilt each draw. Simpler, fast enough at this scale.
+  - CSS injected from tlui.js via a `<style id=laneB-tl-css>` rather than
+    creating `web/style.css` — that file is Lane A's and didn't exist yet.
+    Move into a `/* === LANE B === */` block at SYNC if John wants it
+    centralized. (See REQUEST below.)
+  - M1 crossfade = fade-OUT only; cross-block fade-IN is M2 "crossfade polish"
+    per the milestone list. Marked with a ponytail comment in timeline.js.
+BLOCKED/REQUESTS:
+  - None blocking. Note for orchestrator/Lane A: my timeline styles live in
+    an injected `<style>` in tlui.js. If you'd rather they sit in style.css,
+    say so and I'll emit a `/* === LANE B === */` block for Lane A to paste
+    (I won't edit style.css directly — ownership).
+  - Lane A's files (index.html, stage.js, room3d.js, dock.js, style.css) are
+    present untracked in the shared working dir but uncommitted — I staged
+    ONLY my 5 files, left theirs alone.
+NEXT: Hold at M1 boundary. At SYNC 1 the stub swaps for the real Stage
+  (one-line change in the page import) and tldev.html/stagestub.js get
+  deleted. M2 (locked): clip crossfade polish, params/cut lane UI, snapping
+  config, undo Ctrl+Z already stubbed, box-select multi-drag.