feat(ru-code): restore WS connection stability + process/IO hardening#9
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Restores the WS connection-stability feature that a cleanup commit
deleted, plus process I/O hardening. Success paths unchanged.
- **WS stability:** restore effect RpcClient heartbeat patch +
intentional-close tracking — a deliberate reconnect/dispose close is
no longer misread as a disconnect, so no retry/connection leak.
- **Process I/O:** end child stdio on process exit (+250ms drain), not
EOF — fixes hangs when AV/git daemon holds the pipe open.
- **Terminal:** show real open-failure reason in UI (was generic
"Failed to open terminal"); log the cause server-side.
- **RPC:** restore per-RPC failure logging lost with telemetry
(defect→ERROR, typed/interrupt→DEBUG).
- **Timeouts:** consolidate all server timeout literals into timeouts.ts.
- **Tests:** haltOnExit, preflight probe, terminal errors.
### Enable WS debug logging (web)
In the browser DevTools console:
localStorage.debugging = "ws" // then reload
Combine layers with commas: "ws,mcp". Disable:
delete localStorage.debugging // then reload
Off by default — zero console noise, no cost on hot paths.
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Restores the WS connection-stability feature that a cleanup commit
deleted, plus process I/O hardening. Success paths unchanged.
Enable WS debug logging (web)
In the browser DevTools console:
localStorage.debugging = "ws" // then reload
Combine layers with commas: "ws,mcp". Disable:
delete localStorage.debugging // then reload
Off by default — zero console noise, no cost on hot paths.