Fix Inspiredesign product authority and output specificity

[freshtechbro]

Summary

• Hardens Inspiredesign product-ready semantics so canonical Pinterest pins require manifest-backed pin-media authority for productSuccess/artifactAuthority/evidenceAuthority.
• Keeps guidance readiness distinct from product authority in CLI, public surface, docs, and shipped skill workflows.
• Grounds design outputs, Canvas handoff, media notes, and token strategy in run-specific media evidence with separate light/dark token maps.
• Documents the Pinterest search_shell, harvest readiness, output specificity, and motion-evidence investigations.

Verification

• npm run lint
• npm run typecheck
• npm run build
• npm run extension:build
• npm run version:check
• npm run test, 5,499 passed, 1 skipped
• coverage/lcov.info branch math: 25,364/26,146 hit, 25,362 needed, deficit 0
• node scripts/docs-drift-check.mjs
• ./skills/opendevbrowser-best-practices/scripts/validate-skill-assets.sh
• ./skills/opendevbrowser-design-agent/scripts/validate-skill-assets.sh
• ./skills/opendevbrowser-motion-design/scripts/validate-skill-assets.sh
• git diff --check origin/main...HEAD
• RepoPrompt final precommit review PASS: F2AD0958-2831-4924-96DF-35C89F8E46F8

Live proof

• Inspected latest image and video bundles under .tmp/inspiredesign-live-20260627T191515Z.
• Both bundles report ready=true, productSuccess=true, artifactAuthority=product_ready, evidenceAuthority=pin_media_ready.
• Both bundles have manifest-backed first-party pin-media, advisory-only media-analysis.json, empty screencast motion-evidence.json where expected, and separate light/dark token maps.

Staging notes

• Excluded generated/local roots: .tmp/, .opendevbrowser/, coverage/, dist/, opendevbrowser/*.json.
• Excluded stale out-of-scope docs: docs/investigations/ffmpeg-inspiredesign-landing-qa-2026-06-27.md and docs/reviews/landing-risk-review-2026-06-27.md.