fix(run): add event watchdog and secondary timeout for hasReceivedMeaningfulWork

Implements fixes from issue #1880 and #1934 to prevent exit code 130 timeout in CI environments:

- Add lastEventTimestamp to EventState for tracking when events were last received
- Add event watchdog: if no events for 30s, verify session status via direct API call
- Add secondary timeout: after 60s without meaningful work events, check for active children/todos and assume work is in progress

This prevents the poll loop from waiting for full 600s timeout when:
1. Event stream drops silently (common in CI with network instability)
2. Main session delegates to children without producing meaningful work on main session

src/cli/run/event-state.ts

@@ -7,6 +7,8 @@ export interface EventState {
   currentTool: string | null
   /** Set to true when the main session has produced meaningful work (text, tool call, or tool result) */
   hasReceivedMeaningfulWork: boolean
+  /** Timestamp of the last received event (for watchdog detection) */
+  lastEventTimestamp: number
   /** Count of assistant messages for the main session */
   messageCount: number
   /** Current agent name from the latest assistant message */
@@ -54,6 +56,7 @@ export function createEventState(): EventState {
     lastPartText: "",
     currentTool: null,
     hasReceivedMeaningfulWork: false,
+    lastEventTimestamp: Date.now(),
     messageCount: 0,
     currentAgent: null,
     currentModel: null,