docs(11-01): complete sort_order + reorder backend plan

- Create 11-01-SUMMARY.md with full execution record
- Update STATE.md: progress 89%, decisions, metrics, session
- Update ROADMAP.md: phase 11 marked in-progress (1/2 plans)
- Mark requirements RANK-01, RANK-04, RANK-05 complete

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.3
 milestone_name: Research & Decision Tools
 status: planning
-stopped_at: Phase 11 context gathered
-last_updated: "2026-03-16T21:02:25.762Z"
+stopped_at: Completed 11-candidate-ranking/11-01-PLAN.md
+last_updated: "2026-03-16T21:23:51.903Z"
 last_activity: 2026-03-16 — Roadmap created for v1.3 milestone
 progress:
   total_phases: 4
   completed_phases: 1
-  total_plans: 1
-  completed_plans: 1
+  total_plans: 3
+  completed_plans: 2
   percent: 0
 ---
 
@@ -51,6 +51,7 @@ Progress: [░░░░░░░░░░] 0%
 
 *Updated after each plan completion*
 | Phase 10-schema-foundation-pros-cons-fields P01 | 6min | 2 tasks | 9 files |
+| Phase 11-candidate-ranking P01 | 4min | 2 tasks | 8 files |
 
 ## Accumulated Context
 
@@ -65,6 +66,9 @@ Key v1.3 research findings (see research/SUMMARY.md):
 - [Phase 10-schema-foundation-pros-cons-fields]: Empty string for pros/cons stored as-is (not normalized to null); test accepts either empty string or null as cleared state
 - [Phase 10-schema-foundation-pros-cons-fields]: Pros/Cons badge uses purple color to distinguish from weight (blue), price (green), category (gray), and status badges
 - [Phase 10-schema-foundation-pros-cons-fields]: Field-addition ladder pattern: schema -> migration -> test helper -> service -> Zod -> types -> hook -> form -> card indicator
+- [Phase 11-candidate-ranking]: sortOrder uses REAL type for future fractional midpoint insertions without bulk rewrites
+- [Phase 11-candidate-ranking]: 1000-gap sort_order strategy: first=1000, append=max+1000, reorder resets to (index+1)*1000
+- [Phase 11-candidate-ranking]: Applied sort_order migration via sqlite3 CLI directly to avoid Drizzle data-loss warning on existing rows
 
 ### Pending Todos
 
@@ -76,6 +80,6 @@ None active.
 
 ## Session Continuity
 
-Last session: 2026-03-16T21:02:25.760Z
-Stopped at: Phase 11 context gathered
-Resume file: .planning/phases/11-candidate-ranking/11-CONTEXT.md
+Last session: 2026-03-16T21:23:51.901Z
+Stopped at: Completed 11-candidate-ranking/11-01-PLAN.md
+Resume file: None