Add reverse-IPC protocol support: Rust runtime can send intercept_llm
requests to cowork-service, which routes them through @bytelyst/llm-router.
Changes:
- ipc-bridge.ts: handleLine now detects incoming requests (has 'method' field)
vs normal responses. New handleIncoming() + sendResponse() for reverse IPC.
New onIncomingRequest() to register the handler.
- server.ts: Wires intercept_llm handler — validates messages, calls
getLlmRouter().chat(), records spend for budget tracking, logs provider/model.
- ipc-bridge.test.ts: 5 new tests for reverse IPC (handler registration,
routing, error handling, request vs response disambiguation).
- server.test.ts: Updated IPC bridge mock with onIncomingRequest.
Test count: 85 (was 80)
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