fix(startup): omit unset serve development option

[INONONO66]

Summary

• build shared Bun.serve options without a development key
• add the development option only in non-production mode so production does not pass undefined for an exact optional field

Verification

• ./node_modules/.bin/tsc --noEmit --pretty false --exactOptionalPropertyTypes true 2>&1 | rg "src/index.ts" || true
• bun test tests/unit/startup.test.ts
• ./node_modules/.bin/tsc --noEmit --pretty false
• git diff --check
• bun run release-check
• LSP diagnostics for src/index.ts: no diagnostics

---

Summary by cubic

Fixes startup by not passing an unset development option to Bun.serve in production. We now build shared serve options and only add development in non-production, avoiding undefined on an exact optional field and clearing TypeScript diagnostics with --exactOptionalPropertyTypes.

^{Written for commit 0c7095d. Summary will update on new commits.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3041de0d-f810-4c4a-8228-729ff2699642

📥 Commits

Reviewing files that changed from the base of the PR and between c3ebcd4 and 0c7095d.

📒 Files selected for processing (1)

• src/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/startup-serve-options-exact-optional

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}