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Turns a template into an ordered list of editable scene blocks instead of one monolithic composition — the foundation for the scene-based template engine (all Renderforest-style types, per-scene editable duration, add/duplicate/ delete/reorder). Render-side only; backend wiring is Phase 2. - src/scenes/types.ts: SceneInstance/BlockProps/SceneBlock + withDefaults/clamp. - src/scenes/chrome.tsx: shared 2.5D Three.js backdrop (parallax camera, blobs, particles, optional 3D confetti) + grain/vignette/progress/kicker/transition. - src/scenes/blocks/*: Core 6 blocks — TitleCard, CharacterScene (full room + vendored CC0 character behind a desk), ImageCaption, KineticQuote, Slideshow, OutroCTA — each with editable fields + its own duration range. - src/scenes/registry.ts: the block registry (blockId -> block). - src/compositions/FlexStory.tsx: the sequencer — stacks blocks in <Sequence>, clamps per-scene duration, and computes composition length dynamically via calculateMetadata (so add/delete/reorder/duration all flow to the render). - StoryScenes.tsx: the 2.5D story proof this productizes; docs/TEMPLATE_BRIEF.md: the guided creator flow + Template Spec. Verified: all 6 blocks render via FlexStory in 16:9/1:1/9:16; a custom props override (reordered scenes, custom characters/durations/colors) renders correctly and the total length tracks Σ per-scene durations. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>