feat(02-03): retry-aware failure escalation pipeline

- Add MAX_RETRY_ATTEMPTS (2) and RETRY_COOLDOWN_MS (30s) constants
- Replace immediate escalation with retry-then-escalate logic
- Escalation chain: retry same agent -> manager -> CEO -> user notification
- Reset retry count on successful task completion
- Update Reassign on run failure automation rule with afterRetryExhaustion condition
- Add comprehensive unit tests for escalation state machine (11 tests)

src/main/default-automation-rules.ts

@@ -32,9 +32,10 @@ export const DEFAULT_AUTOMATION_RULES: ReadonlyArray<{
   },
   {
     name: "Reassign on run failure",
-    description: "When a run fails, attempt to reassign the task to another capable agent.",
+    description: "When a run fails after exhausting retries, attempt to reassign the task to another capable agent.",
     trigger: "run_failed",
     action: "reassign_task",
+    conditionsJson: JSON.stringify({ afterRetryExhaustion: true }),
     priority: 75,
   },
   {