## What changed
- Start inbound exec-server request spans when messages enter the connection queue and carry them through dispatch and response handling.
- Record request outcomes for client-handled network policy callbacks, including errors and disconnections.
- Add the `exec_server_request_queue_duration_seconds` histogram, labeled by bounded route name, while excluding synchronous route setup time.
## Testing
- Cover span lifetime and trace-parent propagation across server and client queues.
- Verify queue-duration telemetry and outcome recording for completed, rejected, and cancelled requests.
GitOrigin-RevId: ed67fe5305048bdf283a26ec874337d549e3324f
## Why
Sequential dispatch lets a long-running request block unrelated health checks
and cleanup on the same connection.
## What changed
- Add `--concurrent-requests <COUNT>` for local and remote exec-server
connections, while retaining sequential dispatch when the option is omitted
or set to `1`.
- Preserve handshake ordering before enabling concurrent dispatch.
- Reserve separate capacity for status, signal, terminate, and close requests so
they remain responsive when ordinary request capacity is saturated.
- Drain queued client responses during disconnect and cancel outstanding
request tasks during connection shutdown.
## Testing
- Cover CLI parsing and concurrency-limit validation.
- Verify default sequential behavior, pipelined handshake ordering, concurrent
request progress, control-request responsiveness, and disconnect handling.
GitOrigin-RevId: 48e4b092e318204ed635543f01f9ee0e7df095fc
## What changed
- Move JSON-RPC request, notification, response, error, and malformed-message handling into a dedicated `RequestDispatcher`.
- Keep the connection loop responsible for receiving events and closing the connection when dispatch reports a terminal condition.
## Testing
- Add an integration test confirming that ordinary requests are processed serially by default, including when a blocking `process/read` queues later requests.
GitOrigin-RevId: 29d1358d4524edd492ff3855b29f23c42c8b3390
Ben Romano