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Vance IngallsandClaude Sonnet 5
5dc93a25ad
An audio element carrying `data-audio-group` no longer lands its gain on the master bus directly — it feeds a per-group `GainNode` (built lazily on first use, one per group id) which itself feeds master, so members of the same group sum before the ear, ready for a group-level FX chain and volume/mute in later steps. An id with no matching `<hf-audio-group>` element still gets a plain, unprocessed bus rather than losing the track. The group's own chain and volume lane are wired through the same `attachElementFxChain`/`scheduleVolumeLane` every element already uses, against the group's clock — composition time (design doc §1.3), since a group has no `data-start` and a missing one parses as 0. The bus persists across `stopAll()` (mirroring `_masterGain`'s own lifecycle) so replaying a group does not rebuild its chain; only `destroy()` disposes it. Render is untouched — stays flat until B4; `audio-groups` is still a 0% canary so nothing ships this to a real composition without hand-authoring `data-audio-group`. Also: `audioGroupOf` (B1) crashed on any element lacking a real `tagName`/ `getAttribute` — exactly the shape of most `HTMLMediaElement` test doubles in this suite, including this file's own `mockEl`. Made it tolerant, same style as `readChain`'s existing guard in `runtime/audioFx.ts`. `schedulePlayback` was already 110 lines pre-existing before this diff; extracted `resolveDestination` and `handleSourceEnded` to shrink it to 92, then suppressed the remainder (inherently sequential graph wiring, not a decision tree) per the same precedent B2 used on `TimelineLogicalRow`. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>