perf(api): minimize cold isolate initialization

[Makisuo]

Summary

• Replace startup-time reflection over every domain HTTP error with a checked-in generated identifier list plus drift test.
• Serve /health and OPTIONS without loading routes, services, auth, database, or telemetry.
• Parallelize independent cold imports and MCP session loading; reuse immutable request context.
• Let failed handler/RPC initialization recover on a later request and remove the redundant telemetry macrotask.

Benchmark

Relative to the preceding stack layer:

• workerd active startup CPU: 117.8 ms → 30.7 ms (-73.9%).
• desktop startup heap proxy: 30.85 MB → 5.03 MB (-83.7%).
• compressed bundle: 2,544.19 KiB → 2,534.29 KiB.
• cold GET /health, five-run median: 125.6 ms → 7.4 ms (-94.1%).
• the cold real-route combined local proxy stays flat (246.8 ms → 248.2 ms): schema work moves from startup into the first real request instead of disappearing.

Verification

• API and domain typechecks passed.
• CORS fast-path tests: 2 passed.
• Anticipated-error tests: 4 passed; generated output check passed (111 identifiers).
• Vendored Effect HTTP API tests: 48 passed.

Stack: 2/3. Based on #593; followed by #595.

_{Stack created with GitHub Stacks CLI • Give Feedback 💬}

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[github-actions]

🍁 Maple PR preview

Note

Preview resources were removed when this pull request closed.

Final commit 946a63f · View workflow run