Report executions lost to a session reset

[RhysSullivan]

When the MCP session Durable Object is reset mid-execute (isolate memory or CPU limit, storage timeout, deploy), the front worker has already returned HTTP 200 with an SSE body. The socket to the DO closed, the bridge closed the writer, and the client got a cleanly terminated stream with no JSON-RPC response. Its recovery GET then resumed a stream with nothing to replay and hung on keepalives. Clients waited until their own timeout, or forever.

• Front worker: track the request ids each POST owes. On any socket close other than the normal delivered close, or when a response deadline passes, write a -32010 error per outstanding id before closing. Happy path is byte-identical.
• Durable Object: stamp the request-id ledger with an incarnation epoch. On the next GET, answer ids left by a previous incarnation with the same error and close the stream. Stale rows no longer extend the idle lease.
• Classify the plain memory-limit reset as transient, like the CPU-limit one. The storage-cache variant stays unclassified.

Tests cover the bridge (abnormal close, unchanged happy path, deadline, deadline-constant drift), the epoch ledger, and the classifier. Not covered: an end-to-end scenario that resets a DO mid-execute; there is no hook for it.

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