What Problem This Solves

spawnGogServe attaches data listeners to child.stdout and child.stderr, but does not attach error listeners. If either stream emits an error event, the unhandled error can crash the OpenClaw process even though the watcher startup itself would otherwise succeed.

Why This Change Was Made

Add error handlers to both stdout and stderr streams before the data handlers. The handlers log the error and continue, mirroring the existing child.on("error", ...) logging pattern.

User Impact

More robust Gmail watcher startup: transient stream read errors no longer crash the process.

Evidence

• Added a regression test in src/hooks/gmail-watcher.test.ts that mocks spawn to return a fake child with stdout/stderr EventEmitters, emits error events on both streams, and verifies startGmailWatcher still resolves successfully.
• Verified that without this fix, the test run reports an uncaught Error: stdout read failed; with the fix, no unhandled error is reported.
• oxlint passes on the changed files.