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Introduces <hf-audio-group> and data-audio-group as the group model B2–B7 and C1 build on: a non-rendering group element carries a label and (later) an FX chain, membership lives on the member's own data-audio-group attribute rather than DOM nesting, so a track removed from the document simply drops out of the group on the next resolve — nothing dangles. Groups do not nest: data-audio-group on the group element itself is ignored. A group with members but no <hf-audio-group> element still resolves, label falling back to the id, so hand-authored HTML degrades gracefully. Audio only in v1 — video members are ignored. Parse-only: nothing routes or sums audio yet (B3/B4). Adds the audio-groups canary at percentage: 0 gating the future Studio UI; the element and attribute parse and play regardless of enrollment. Verified rather than assumed per this plan's standing rule: the timeline's clip-collection selector ([data-start], [data-track-index], [data-composition-id], video, audio, img) already excludes the group element with zero changes, and no lint rule flags unknown elements or data-* attributes, so neither needed touching — confirmed by grep and by running `hyperframes lint` against a fixture containing the element (0 findings referencing it). The step doc's suggested display:none injection point (an existing base stylesheet in the runtime) does not exist in this codebase; skipped rather than inventing new infrastructure, since an empty, childless custom element already renders as a zero-size inline box with no visible output — the same reasoning the lint check above confirms empirically. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>