[kixelated]

Replaces canvases with composable scenes, settled with the maintainer through /quest-plan on 2026-11-05. #54 is closed in favor of this plan.

Quests

• New m0 epic Composable scenes, replacing what was left of quest/m0/multi-canvas.md:
  1. [M] Scene source: a scene draws another scene, or program, as a source.
  2. [L] Published scenes: any scene publishes at <broadcast>/<scene> at its own size, and canvases go away. It carries over feat(studio)!: unlink canvases, record and grade each canvas, and preview only what is seen #54's Health per broadcast, the recording pick, and the preview skip.
  3. [M] Audio scenes: mixes become audio-only scenes that nest.
• New m1 quest Scene graph view: a node view of the same graph.
• The m0 goal, destinations, and virtual camera quests now speak of published and audio scenes instead of canvases and mixes.

Decisions

• Model: ✅ published scenes + Program source; published scenes, no linking; keep canvases.
• feat(studio)!: unlink canvases, record and grade each canvas, and preview only what is seen #54: ✅ close and salvage into the new quest; land, then rework.
• Following cuts: ✅ scene source including program; program source only.
• Program: ✅ program at <broadcast>, one switcher; every scene switchable.
• Sizes: ✅ each scene has a size; only published scenes have one.
• Audio: the maintainer asked whether an audio-only scene would be a mix. ✅ Mixes = audio scenes, independent of cuts; scenes carry their own audio; keep [mixes] separate.
• UI: the maintainer asked about a graph, like pro tools. ✅ Scenes list + mixer, graph view later; graph panel in this epic; graph replaces mixer.
• Structure: ✅ an m0 epic with 3 quests, in that order.

Review

• Round 1 (Codex gpt-6.1-sol, medium) on 48d5aae: no findings.

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Commits

Reviewing files that changed from the base of the PR and between 5709ef7 and 48d5aae.

Files selected for processing: 13

• quest/m0/README.md
• quest/m0/destinations.md
• quest/m0/multi-canvas.md
• quest/m0/scenes/README.md
• quest/m0/scenes/audio.md
• quest/m0/scenes/published.md
• quest/m0/scenes/scene-source.md
• quest/m0/vcam/README.md
• quest/m0/vcam/linux.md
• quest/m0/vcam/macos.md
• quest/m0/vcam/windows.md
• quest/m1/README.md
• quest/m1/scene-graph.md

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[kixelated]

Automated review by review (OpenAI)

Reviewed commit 48d5aae. Composable scenes and an explicit Program source are a reasonable simplification, but two planning conflicts need decisions:

1. [P2] Define cycle rejection when Program changes (quest/m0/scenes/scene-source.md:5–8). Program's graph edges change at a cut or transition, not only an edit. If B contains Program while A is live, cutting to B creates Program → B → Program without an edit. Reject dynamic cycles on Cut/Transition and load/undo, including both transition endpoints, or prohibit Program-dependent scenes from entering the switcher. Add this scenario to acceptance tests.
2. [P2] Reconcile shared rendering with independent activation clocks (quest/m0/scenes/scene-source.md:20–21). During a transition A → B, both may contain keyframed child C: outgoing A needs its existing animation time while incoming B needs C restarted. One cached texture per scene per frame cannot satisfy both. Define a shared activation policy or cache by scene plus activation context, and test shared animated children across a transition.

Verification: GitHub-only static review of the plans and relevant compositor timing. These are specification conflicts, not runtime reproductions; I did not run tests.