refactor: remove Bun artifacts and convert remaining Bun APIs

[BYK]

Phase 5: Bun Cleanup

Final phase of the Bun → Node.js migration. Removes Bun-specific artifacts and converts the last remaining Bun API usages.

Changes

Removed Bun artifacts:

• bun.lock and docs/bun.lock — replaced by pnpm-lock.yaml (added in Phase 4)
• bunfig.toml — Bun configuration, no longer needed
• @types/bun from devDependencies — replaced by src/global.d.ts
• .cursor/rules/bun-cli.mdc — outdated Bun-specific Cursor AI rule

Converted remaining Bun APIs:

• src/commands/local/run.ts: Bun.spawn() → spawn() from node:child_process
• src/commands/local/server.ts: Bun.sleep() → sleep() from node:timers/promises
• Removed corresponding spawn/sleep polyfills from script/node-polyfills.ts

Added type declarations (src/global.d.ts):

• Worker class with typed event map (previously from @types/bun)
• RegExp.escape() augmentation (ES2025, Node 23.6+)

Test fixes:

• test/commands/local/run.test.ts: removed isBun skip guard (now runs on Node)
• test/lib/db/concurrent.test.ts: removed isBun skip guard, switched worker spawn to tsx
• test/script/node-polyfills.test.ts: removed spawn polyfill tests

Intentionally kept

• bun:sqlite try/catch in src/lib/db/sqlite.ts — compiled Bun binary still needs it
• node-polyfills.ts — still used by bundle.ts for the npm CJS distribution
• Bun.build() in script/build.ts — no Node equivalent for binary compilation
• setup-bun in build-binary CI job

[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://cli.sentry.dev/_preview/pr-1002/
Built to branch gh-pages at 2026-05-22 09:02 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit e57f6cc. Configure here.}

[github-actions]

Codecov Results 📊

✅ Patch coverage is 83.33%. Project has 4236 uncovered lines.
✅ Project coverage is 81.86%. Comparing base (base) to head (head).

Files with missing lines (2)

File	Patch %	Lines
src/commands/local/run.ts	90.91%	⚠️ 1 Missing and 2 partials
src/commands/local/server.ts	0.00%	⚠️ 1 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    81.63%    81.86%    +0.23%
==========================================
  Files          328       328         —
  Lines        23343     23349        +6
  Branches     15111     15114        +3
==========================================
+ Hits         19055     19113       +58
- Misses        4288      4236       -52
- Partials      1614      1621        +7

---

Generated by Codecov Action