Refresh public export for v0.4.0

[AniketDeshpandeGit]

Summary

• refresh public projection from private v0.4.0 source
• add Codex hook parity, scene/turn lifecycle updates, titlebar polish, downloads badge, and dependency maintenance
• update release workflow defaults and pinned setup-go action for v0.4.0

Validation

• private repo: pnpm install --frozen-lockfile
• private repo: pnpm audit --audit-level low --prod
• private repo: git diff --check
• private repo: cd remote-collector && go test ./...
• private repo: pnpm typecheck:main
• private repo: pnpm test
• private repo: pnpm test:ui
• private repo: pnpm ui:capture
• private repo: pnpm build
• private repo: pnpm make
• public candidate: pnpm public:refresh validation PASS

Notes

• public release remains macOS arm64 only
• generated release notes now come from CHANGELOG.md
• supersedes Dependabot PRs chore(actions): bump actions/setup-go from 5.6.0 to 6.4.0 #52 and chore(deps)(deps): bump ws from 8.20.1 to 8.21.0 #53