feat: Add timeout handling for remote message sends and URL redemptions

[sirtimid]

Closes #657

Add 10-second timeout for network message sends and 30-second timeout for URL redemptions using AbortSignal.timeout. Both timeouts clean up pending operations and trigger appropriate error handling. Includes comprehensive test coverage for timeout scenarios.

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Note

Adds 10s timeout for network writes and 30s timeout for ocap URL redemption using AbortSignal.timeout, with cleanup, reconnection handling, and comprehensive tests aided by a new AbortSignal mock.

• OCAP Kernel Remotes:
  • RemoteHandle.redeemOcapURL:
    • Add 30s timeout via AbortSignal.timeout; race reply vs. timeout; clean pending map and listeners on completion/error.
  • remotes/network.ts:
    • Introduce writeWithTimeout(channel, message, 10_000) using AbortSignal.timeout.
    • Use writeWithTimeout in sendRemoteMessage and flushQueuedMessages; on timeout, log, requeue, and trigger reconnection.
• Tests:
  • RemoteHandle.test.ts: add timeout tests for URL redemption, including cleanup assertions.
  • network.test.ts: add "message send timeout" suite covering hangs, success-before-timeout, concurrent writes, and error propagation.
• Test Utilities:
  • Add packages/repo-tools/src/test-utils/abort-signal.ts with makeAbortSignalMock; export from test-utils/index.ts.
• Config:
  • Minor coverage threshold adjustments in vitest.config.ts.

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[FUDCo]

Well OK then.

[FUDCo]

Oh yeah