docs(10-01): complete multi-question schema plan

Tasks completed: 3/3
- Update agent output schema to questions array
- Update PendingQuestion type to PendingQuestions
- Update AgentWaitingEvent payload

SUMMARY: .planning/phases/10-multi-question-schema/10-01-SUMMARY.md

.planning/STATE.md

@@ -10,18 +10,18 @@ See: .planning/PROJECT.md (updated 2026-01-31)
 ## Current Position
 
 Phase: 10 of 13 (Multi-Question Schema)
-Plan: Not started
-Status: Ready to plan
-Last activity: 2026-01-31 — Milestone v1.2 created
+Plan: 1 of 1 complete
+Status: Phase complete
+Last activity: 2026-01-31 — Completed 10-01-PLAN.md
 
-Progress: ░░░░░░░░░░ 0%
+Progress: █░░░░░░░░░ 3%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 35
+- Total plans completed: 36
 - Average duration: 3 min
-- Total execution time: 111 min
+- Total execution time: 116 min
 
 **By Phase (v1.0):**
 
@@ -36,7 +36,7 @@ Progress: ░░░░░░░░░░ 0%
 | 6 | 3/3 | 9 min | 3 min |
 
 **Recent Trend:**
-- Last 5 plans: 09-02 (3 min), 09-01 (3 min), 08.1-02 (4 min), 08.1-01 (5 min), 08-02 (3 min)
+- Last 5 plans: 10-01 (5 min), 09-02 (3 min), 09-01 (3 min), 08.1-02 (4 min), 08.1-01 (5 min)
 - Trend: Steady
 
 ## Accumulated Context
@@ -119,6 +119,9 @@ Recent decisions affecting current work:
 - 09-02: Database is source of truth for recovery tests (not in-memory queue state)
 - 09-02: Blocked task recovery via DB update and re-queue
 - 09-02: Q&A flow tests use schema-aligned scenarios
+- 10-01: Status 'questions' (plural) for clarity when payload is array
+- 10-01: Each question has id field for matching answers in batched resume
+- 10-01: Single question uses array: `questions: [{ id: 'q1', question: '...' }]`
 
 ### Pending Todos
 
@@ -139,5 +142,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-01-31
-Stopped at: Milestone v1.2 initialization
+Stopped at: Completed Phase 10 (Multi-Question Schema)
 Resume file: None