chore: prepare 0.0.40 release

[freshtechbro]

Summary

• prepare 0.0.40 package and extension version metadata
• update active release runbooks, docs pointers, changelog, and release plan
• add docs/RELEASE_0.0.40_EVIDENCE.md with local gate evidence and pending external publish slots

Verification

• npm run version:check
• node scripts/docs-drift-check.mjs
• git diff --check
• npm ci
• npm audit --omit=dev
• npm audit --audit-level=moderate
• node scripts/chrome-store-compliance-check.mjs
• npm run test:release-gate
• npm run lint
• npm run typecheck
• npm run build
• npm run extension:build
• npm run test (5802 passed, 1 skipped; branch coverage 26831/27655 = 97.0204%)
• node scripts/audit-zombie-files.mjs
• ./skills/opendevbrowser-best-practices/scripts/validate-skill-assets.sh
• ./skills/opendevbrowser-motion-design/scripts/validate-skill-assets.sh
• npx opendevbrowser --help
• npx opendevbrowser help
• npm run extension:pack
• npm pack --dry-run

Release Notes

• npm and GitHub publish evidence remain pending until this release-prep PR merges to main.
• Chrome Web Store release is a manual browser lane and remains pending until the GitHub release artifact exists.
• Local npm auth and target absence were verified without exposing credentials.