fix(selfhost): catch startup orb relay drain failures

[JSONbored]

Motivation

• Prevent an unhandled promise rejection at startup when drainOrbRelay now throws on broker/fetch failures, which can crash the self-host process in ORB_RELAY_MODE=pull instead of recording the failure and retrying.

Description

• Add a .catch(...) to the initial drainRelay() invocation in src/server.ts that reports the error via captureError(error, { kind: "orb_relay_drain" }), matching the recurring interval handler and preserving the existing retry behavior.

Testing

• Ran git diff --check, npx vitest run test/unit/selfhost-monitored-work.test.ts test/unit/orb-broker-client.test.ts, and npm run typecheck, and all checks passed.

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Codex Task

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[loopover-orb]

Important

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed · 🟪 Reviewing}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.58%. Comparing base (3a74800) to head (5c81576).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4018   +/-   ##
=======================================
  Coverage   93.58%   93.58%           
=======================================
  Files         381      381           
  Lines       35483    35483           
  Branches    13014    13014           
=======================================
  Hits        33206    33206           
  Misses       1617     1617           
  Partials      660      660           

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