chore: release 0.0.23

[freshtechbro]

Summary

• bump the package and extension metadata to 0.0.23
• update versioned install references in README, CLI docs, and first-run onboarding
• carry the validated release artifacts from the clean worktree onto main

Verification

• npm run version:check
• npm run test:release-gate
• node scripts/audit-zombie-files.mjs
• node scripts/docs-drift-check.mjs
• node scripts/chrome-store-compliance-check.mjs
• ./skills/opendevbrowser-best-practices/scripts/validate-skill-assets.sh
• npm run lint
• npm run typecheck
• npm run test
• npm run build
• npx opendevbrowser --help
• npx opendevbrowser help
• npm run extension:build
• npm run extension:pack
• npm pack