docs(09-03): complete task assignment plan

.planning/phases/09-etapes/09-03-SUMMARY.md

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+---
+phase: 09-etapes
+plan: 03
+subsystem: tasks
+tags: [go, htmx, templ, etapes]
+requires:
+  - phase: 09-etapes
+    plan: 02
+    provides: etape management routes and fragments
+provides:
+  - task create and edit Etape selector
+  - task update assignment and unassignment
+  - same-tablo validation for task etape assignment
+affects: [09-etapes, tasks]
+tech-stack:
+  added: []
+  patterns: [selector-based assignment, same-tablo validation before task update]
+key-files:
+  created: []
+  modified:
+    - backend/internal/web/handlers_tasks.go
+    - backend/templates/tasks.templ
+    - backend/templates/tasks_forms.go
+    - backend/internal/web/handlers_tasks_test.go
+key-decisions:
+  - "Keep task-card quick assignment dropdowns out of this phase, per UI-SPEC."
+  - "Use the same parseOwnedEtapeID validation helper for create and update."
+patterns-established:
+  - "Task edit forms load etapes from the owned tablo and render escaped option labels."
+  - "Task updates preserve status and position while changing only text fields and etape assignment."
+requirements-completed: []
+completed: 2026-05-15
+---
+
+# Plan 09-03 Summary
+
+**Task create and edit forms can assign or clear an etape with same-tablo validation**
+
+## Accomplishments
+
+- Added RED coverage for edit selector rendering, assign/unassign update behavior, foreign etape rejection, and unassigned filtering.
+- Added visible `Etape` selectors with `No etape` first option to task create and edit forms.
+- Updated task edit/update handlers to load etapes for the owned tablo and validate submitted assignment ids.
+- Preserved task status and position while allowing task update to change etape assignment.
+
+## Task Commits
+
+1. **Task 1: Add RED coverage for assignment and filters** - `9f6c7eb`
+2. **Task 2: Implement form assignment and filter-aware task loading** - `b22d79d`
+
+## Verification
+
+- `cd backend && just generate`
+- `cd backend && go test ./internal/web -run 'TestTaskEditRendersEtapeSelector|TestTaskUpdateAssignsAndUnassignsEtape|TestTaskAssignmentRejectsForeignEtape|TestTasksTabUnassignedFilter|TestTaskUpdate|TestTasksKanbanRenders' -count=1 -v`
+- `cd backend && go test ./... -count=1`
+- `git diff --check`
+
+Note: DB-backed integration tests compile but are skipped locally because `TEST_DATABASE_URL`/`DATABASE_URL` is unset.
+
+## Deviations from Plan
+
+None.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None.
+
+## Next Phase Readiness
+
+Plan 09-04 can now validate reorder preservation and the full browser workflow over the completed create/edit/delete/filter surfaces.
+
+## Self-Check: PASSED