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e1a7c5b860
Fix three child-process stdin write paths that let async EPIPE errors escape to uncaughtException and crash the gateway. extensions/imessage/src/client.ts (the actual #75438 crash path): - Add child.stdin.on('error') listener in start() to catch async EPIPE and reject all pending requests via failAll(). - Add write callback to request() stdin.write() that rejects the specific pending request on error, instead of leaving it hanging until timeout. src/agents/mcp-stdio-transport.ts: - Fix write callback race in send(): previously resolved the promise immediately when write() returned true, then the write callback with EPIPE would fire after the promise was already fulfilled. Now always settles the promise from the write callback so the outcome is known before resolving. src/process/exec.ts: - Add stdin.on('error') before writing input so EPIPE from a prematurely-exited child is swallowed — the process exit handler reports the real status. One reporter observed a gateway crash after 10.5 hours of stable uptime — a single EPIPE on an iMessage RPC child process stdin write killed the gateway with code 1. Fixes: #75438