Summary

• Implement ChannelBridge class — the central orchestrator connecting incoming channel messages to CLI agent execution and delivery
• Single entry point handle() wires together all previously implemented middleware components: runtime factory, session map, error classifier, delivery adapter, system prompt builder, and MCP side effects
• Event stream wrapper (captureResult) extracts AgentRunResult from the done event while passing events through to DeliveryAdapter
• Session key maps ChannelMessage fields to SessionKey for SessionMap integration, with composite string formatting for MCP env vars
• Error classification maps categories to errorSubtype on the result (with context_overflow → "context_window" mapping per spec)
• Temp invocation directory per call with cleanup in finally block

Closes #32

Test plan

• 34 unit tests covering: orchestration flow, streaming callbacks, session lifecycle, MCP config assembly, error handling paths, temp directory cleanup, constructor defaults, buildSessionKey helper
• pnpm build passes
• pnpm check passes (format + typecheck + lint)
• Security guard test (temp-path-guard) passes (uses mkdtemp instead of Math.random)
• CI build and test jobs pass

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