chore: prepare 0.0.39 release

[freshtechbro]

Summary

• Prepare OpenDevBrowser 0.0.39 release metadata, changelog, runbooks, and evidence ledger.
• Sync package and extension version metadata to 0.0.39.
• Document release workflow and skill/install/Inspiredesign reliability guidance updates included in this release prep.

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
• npm run lint
• npm run typecheck
• npm run test:release-gate
• npm run test
• npm run extension:pack
• npm pack --dry-run
• node scripts/live-regression-direct.mjs --release-gate --out artifacts/release/v0.0.39/live-regression-direct.json
• node scripts/provider-direct-runs.mjs --release-gate --out artifacts/release/v0.0.39/provider-direct-runs.json

Provider-direct strict live gate ended with env-limited third-party cases only: 17 pass, 13 env_limited, 0 fail. This is documented in docs/RELEASE_0.0.39_EVIDENCE.md.