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Paweł Banaszewski
0a34a37314
Stacked on #27860. Adds four connection tests that run the real `ai-gateway start` against `coderdenttest` and assert only what an operator or LLM client can observe. A `chaosProxy` between the gateway and coderd simulates outages by answering 503 and closing the connections it accepted, the latter because the DRPC websocket is hijacked and so out of reach of `httptest.Server`. - `RevokedKey`: revoking an in-use key closes the session, and the 401 on redial terminates the command. - `ReconnectAfterDisconnect`: LLM traffic and interception recording resume after a coderd outage, with no intervention. - `RequestWhileDisconnected`: a request arriving while disconnected is parked until the connection returns, not failed. The pre-flight DRPC calls block with the caller's context as the only bound, which is intentional: a caller willing to wait is served on reconnect, and `/readyz` has already withdrawn the replica. The RFC's "fails with 503 if pre-flight DRPC calls cannot complete" does not describe this and needs correcting. - `InFlightRequestSurvivesDisconnect`: a stream whose first chunk already reached the caller completes after the DRPC connection drops. No production code is changed. Refs https://linear.app/codercom/issue/AIGOV-320/write-connection-tests --- Generated with Coder Agents.