docs(11-03): complete mode-aware agent spawning plan

Tasks completed: 3/3
- Update AgentRepository for mode field
- Update ClaudeAgentManager for mode-specific schemas
- Add mode to AgentStoppedEvent reasons (already done in 11-01)

SUMMARY: .planning/phases/11-architect-agent/11-03-SUMMARY.md

.planning/STATE.md

@@ -12,7 +12,7 @@ See: .planning/PROJECT.md (updated 2026-01-31)
 Phase: 11 of 13 (Architect Agent)
 Plan: 4 of 8 in current phase
 Status: In progress
-Last activity: 2026-01-31 — Completed 11-04-PLAN.md
+Last activity: 2026-01-31 — Completed 11-03-PLAN.md
 
 Progress: █████░░░░░ 45%
 
@@ -131,6 +131,9 @@ Recent decisions affecting current work:
 - 11-01: Discuss mode outputs decisions array with topic/decision/reason structure
 - 11-01: Breakdown mode outputs phases array with number/name/description/dependencies
 - 11-01: AgentStoppedEvent reason extended with context_complete and breakdown_complete
+- 11-03: Mode extracted from spawn options with 'execute' default for backwards compatibility
+- 11-03: Separate handler methods per mode (handleExecuteOutput, handleDiscussOutput, handleBreakdownOutput)
+- 11-03: Resume uses mode-specific JSON schema for resumed sessions
 - 11-04: Repositories optional in tRPC context following existing pattern (agentManager, taskRepository)
 - 11-04: createPhasesFromBreakdown accepts pre-numbered phases for Architect breakdown output
 
@@ -153,5 +156,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-01-31
-Stopped at: Completed 11-04-PLAN.md (Initiative & Phase tRPC Procedures)
+Stopped at: Completed 11-03-PLAN.md (Mode-Aware Agent Spawning)
 Resume file: None