Static-analysis follow-ups to the trace-backed fixes; each is cheap
insurance on machines where the profiled headroom doesn't exist.
- highway.js: _makeBundle now mutates one persistent per-instance
object instead of allocating a fresh ~35-field bundle every rAF
frame (xN under splitscreen). Object identity is stable and
meaningless; array fields still swap reference on chart changes,
which field-identity caches rely on. Contract documented in both
CLAUDE.mds.
- highway.js: new bsearchTime (lower-bound on .time) windows the
default 2D renderer's beat-line scan (was O(all beats) per frame);
bundle.lowerBoundT / bundle.lowerBoundTime expose the searches to
custom viz so they stop reimplementing visible-window culling.
- highway_3d: localStorage 'h3d_full_sus' polled at ~1 Hz instead of
every frame (synchronous storage read on the hot path).
- highway_3d: drawLyrics caches the measureText row layout keyed on
(lyrics ref, line index, shown count, font size, width) — per-frame
work is now just drawing over cached widths.
- tests/js: bundle source-shape assertions widened to accept the
assignment form ([:=]) alongside the old object-literal form.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
