docs(05-02): complete template API handlers plan

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Usability and Templates
 status: planning
-stopped_at: Completed 05-template-data-model-and-api-01-PLAN.md
-last_updated: "2026-03-12T11:07:58.758Z"
+stopped_at: Completed 05-template-data-model-and-api-02-PLAN.md
+last_updated: "2026-03-12T11:11:30.005Z"
 last_activity: 2026-03-12 — v1.1 roadmap created, Phases 5-8 defined
 progress:
   total_phases: 8
-  completed_phases: 4
+  completed_phases: 5
   total_plans: 12
-  completed_plans: 11
+  completed_plans: 12
   percent: 0
 ---
 
@@ -51,6 +51,7 @@ Progress: [░░░░░░░░░░] 0%
 
 *Updated after each plan completion*
 | Phase 05-template-data-model-and-api P01 | 3 | 2 tasks | 4 files |
+| Phase 05-template-data-model-and-api P02 | 1min | 2 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -67,6 +68,8 @@ Recent decisions affecting current work:
 - [Phase 05-template-data-model-and-api]: New API-created budget items default to item_tier=one_off at the query layer
 - [Phase 05-template-data-model-and-api]: Template creation is lazy: CreateTemplateItem upserts template via ON CONFLICT
 - [Phase 05-template-data-model-and-api]: GenerateBudgetFromTemplate returns BudgetExistsError struct for structured 409 response
+- [Phase 05-template-data-model-and-api]: PUT /items/reorder registered before PUT /items/{itemId} for correct chi static-before-param routing
+- [Phase 05-template-data-model-and-api]: GenerateBudget returns 409 JSON with budget_id field using BudgetExistsError.ExistingBudgetID
 
 ### Pending Todos
 
@@ -79,6 +82,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-12T11:07:58.757Z
-Stopped at: Completed 05-template-data-model-and-api-01-PLAN.md
+Last session: 2026-03-12T11:11:30.004Z
+Stopped at: Completed 05-template-data-model-and-api-02-PLAN.md
 Resume file: None