Add NodeKit presentation evidence bridge

[HomenShum]

Summary

• registers FeatureClipStudio as a deterministic NodeKit presentation-evidence protocol
• projects real tracked clips/screenshots into a content-addressed nodekit.evidence-index/v1 artifact
• adds strict manifest/receipt schemas and fail-closed path, media, digest, provenance, and drift checks
• keeps generated media, artifact verification, and independent workflow proof explicitly distinct

Proof

• 13/13 Node tests passed
• authoring-worktree and fresh-detached-checkout npm run check passed
• strict AJV 2020 schema validation passed
• central NodeKit repo check passed
• bundled Remotion example rendered 640 frames to H.264 1920×1080

Honest boundary

The three tracked artifacts are observed; there are zero independent browser/judge receipts. releaseReady=false and productWorkflowProof=not-certified. No package publication or production deployment occurred.

Pre-existing and not changed: npm ci lock/self-dependency failure and seven Remotion-chain audit findings.