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James RussoandJake Moran e96ebd74de feat(skills): add changelog-video skill for repo-native CC + Codex discovery (#2552) 
Packages Jake Moran's changelog-video pipeline (v1, validated end-to-end
by Home on the Jun 23-29 range) as a repo-native skill set that Claude
Code (.claude/skills/) and Codex CLI (.agents/skills/) auto-discover the
moment the repo is opened. No install step; run the skill against a
changelog markdown for a given git range and it produces a lint-clean,
seam-gate-green 1080x1080 MP4 (~45-60s, Annie VO, mock-UI visualizations,
caption rail) end-to-end.

Six skills added byte-identical in both mirror dirs:
- changelog-video (pipeline entry point)
- motion-doctrine (carries seam-stamp.mjs + seam-gate.mjs)
- cut-the-curve, captions-overlay, seam-craft, oversized-cursor

Layout:
- .claude/skills/  - Claude Code project-local auto-discover
- .agents/skills/  - Codex CLI project-local auto-discover (verified via
                     Magi's clean-home Codex 0.144.3 repro; NOT .codex/skills/)

Fonts, animated background (12 MB), house BGM (5 MB), lexicon, and
align-captions ship inside the skill dirs. .gitattributes routes only
.claude/skills/**/*.{mp4,mp3} + .agents/skills/**/*.{mp4,mp3} through
LFS — narrowly scoped so unrelated Player, Studio, registry, and
marketplace media stay put. HeyGen CLI auth is the one credential the
skill needs; Node >= 22, ffmpeg, and headless Chrome are documented
alongside in both READMEs.

.gitignore: rewrites .claude/ and .agents/ blocks to keep agent-installed
skill hygiene while re-including the six repo-native skill dirs plus
README.md.

CI:
- Extends changes.skills filter to match .claude/skills/**,
  .agents/skills/**, scripts/lint-skills.ts, and scripts/check-skill-mirror.mjs.
- New 'Skills: project-native lint + mirror' job runs the extended
  lint-skills.ts (schema-driven; required { name, description } + optional
  { license, allowed-tools, metadata }, name pattern check, description
  length check) plus a new check-skill-mirror.mjs byte-integrity script
  (24 mirrored files must match; README.md deliberately per-CLI).
- Wired into 'bun run lint' locally.

Frontmatter validator:
- Rejects unsupported top-level keys (catches category:-style drift).
- Requires name + description.
- Validates name pattern (^[a-z][a-z0-9-]{0,63}$) and description shape
  (non-empty, <=1024 chars).
- Missing frontmatter block itself is a first-class error.

Also strips unsupported top-level 'category:' frontmatter from Jake's
motion-doctrine and cut-the-curve SKILL.mds (both mirrors), rewrites the
TTS invocation from ~/.claude/skills/media-use/... to the tracked
skills/hyperframes-media/scripts/heygen-tts.mjs, swaps npx hyperframes@latest
for the repo-local CLI in the gate step, and fixes a lint issue in Jake's
seam-gate.mjs (ternary-for-side-effect -> if/else).

Validated end-to-end by Home on Jun 23-29 (MP4 posted in C0ACCNHLG3U
thread 1784181166.041319). Independently reviewed R1/R2/R3 by Magi.

Co-authored-by: Jake Moran <jake@heygen.com>
2026-07-16 17:29:19 -04:00

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name, description
name description
seam-craft Render-correctness doctrine for scene-to-scene seams in HyperFrames launch videos — the prerequisites that make transitions composite correctly on the master timeline. Load when assembling the master timeline / index.html, when a white flash appears at a cut or crossfade seam (especially on dark films), when reasoning about why a transition opacity dip shows through, or when verifying the render-side mechanics of how overlapping scene wrappers blend. Covers the opaque stage-ground (#root background) white-flash guard and how the injector overlaps wrappers, holds final frames, ping-pongs tracks, and stamps lint-clean template code onto the master timeline. Does NOT contain the per-transition catalog — see the transition registry for individual transition entries.

Seam Craft — render prerequisites for scene-to-scene transitions

This is the render-correctness doctrine for PLV scene-to-scene seams: the prerequisites and master-timeline mechanics that make any transition composite correctly, independent of which specific transition is chosen. The per-transition catalog (crossfade, push-slide, zoom-through, cut-the-curve, …) lives in the transition registry — this page is the doctrine that sits underneath all of them.

The transitions this doctrine governs are Tier-B-ready: pure transform / opacity / filter on the two scene clip wrappers (#el-<sid>), no injected overlay DOM, no per-scene cooperation. Overlay families (staggered blocks, blinds, light leak, grid dissolve, page burn) and shader transitions are deferred to later phases.

Stage ground prerequisite (white-flash guard)

Several templates open a window where the two wrappers' summed opacity < 1 (the cut-the-curve mid-window cut, zoom-through's 0.15 floor, plain crossfade's power-curve dip). Whatever is BEHIND the wrappers shows through during that window. If the assembled index.html #root has no opaque background, the renderer composites the dip over its default white page → a white flash at every seam, glaring on dark films (observed on two Spotify runs before the fix). The assembler must paint the stage: #root { background: var(--canvas-deep, var(--canvas, #000)) } — assemble-index.mjs now emits this; any other consumer of these templates owns the same guarantee.

How the injector applies a transition

At a break boundary between scene i (from) and scene i+1 (to), the injector:

  1. Extends #el-<from> wrapper data-duration by duration_s (holds its final frame — verified: core/src/runtime/init.ts:1393-1410 external-slot branch).
  2. Pulls #el-<to> wrapper data-start earlier by duration_s (creates the overlap window).
  3. Reassigns all clip data-track-index as a 0/1 ping-pong so the two overlapping wrappers never share a track (same-track overlap is illegal — core/src/lint/rules/composition.ts). Higher track composites on top.
  4. Stamps the gsap_template into window.__timelines["main"] at T = overlap-start.

Verified by prototype render (2026-05-31): the master-timeline wrapper tween is seeked and rendered (no double-seek with the sub-comp's own paused timeline — the runtime drives them independently), the extended wrapper holds scene i's final frame, and the higher-track incoming wrapper composites over + blends with the outgoing one.

Template placeholders

The injector substitutes these tokens in each gsap_template line:

Token Meaning
__OLD__ "#el-<from>" — outgoing clip wrapper selector (quoted)
__NEW__ "#el-<to>" — incoming clip wrapper selector (quoted)
__T__ overlap-start time in seconds (master clock)
__DUR__ duration_s for this boundary
__DX__ horizontal travel for directional types: -1920 (LEFT) / 1920 (RIGHT)
__DY__ vertical travel: -1080 (UP) / 1080 (DOWN)
__ORIGIN_OUT__ / __ORIGIN_IN__ transformOrigin pair for squeeze

filter / scaleX / transformOrigin are lint-clean on the master timeline (verified: core/src/lint/rules/gsap.ts has no per-property whitelist and scopes its checks to data-composition-id ranges; the x/y/scale/rotation/opacity whitelist is a scene-worker prompt rule only — it does not bind index.html).

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