docs(11-01): complete agent mode schema extension plan

Tasks completed: 3/3
- Add AgentMode type and database column
- Create mode-specific output schemas
- Update MockAgentManager for mode support

SUMMARY: .planning/phases/11-architect-agent/11-01-SUMMARY.md

.planning/STATE.md

@@ -12,7 +12,7 @@ See: .planning/PROJECT.md (updated 2026-01-31)
 Phase: 11 of 13 (Architect Agent)
 Plan: 2 of 8 in current phase
 Status: In progress
-Last activity: 2026-01-31 — Completed 11-02-PLAN.md
+Last activity: 2026-01-31 — Completed 11-01-PLAN.md
 
 Progress: ████░░░░░░ 35%
 
@@ -127,8 +127,10 @@ Recent decisions affecting current work:
 - 10-02: CLI accepts JSON object or single string (defaults to q1 key)
 - 10-03: setAgentQuestion convenience wraps single question in array format
 - 10-03: Multi-question test covers 3 questions with mixed option types
-- 11-02: findByStatus returns array (not null) for consistency with findAll pattern
-- 11-02: getNextNumber uses max() aggregate, returning 1 if no phases exist
+- 11-01: AgentMode stored in database with 'execute' default for backwards compatibility
+- 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
 
 ### Pending Todos
 
@@ -149,5 +151,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-01-31
-Stopped at: Completed 11-02-PLAN.md (Initiative & Phase Repositories)
+Stopped at: Completed 11-01-PLAN.md (Agent Mode Schema Extension)
 Resume file: None