docs(phase-02): create phase plans for file management

.planning/phases/02-data-persistence-file-management/02-VALIDATION.md

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+---
+phase: 02
+slug: data-persistence-file-management
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-12
+---
+
+# Phase 2 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | pytest (Python) + Flask test client |
+| **Config file** | tests/ (Wave 0 creates) |
+| **Quick run command** | `pytest tests/test_api.py -v` |
+| **Full suite command** | `pytest tests/ -v` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `pytest tests/test_api.py -v`
+- **After every plan wave:** Run `pytest tests/ -v`
+- **Before `/gsd-verify-work`:** Full suite must be green
+- **Max feedback latency:** 30 seconds
+
+---
+
+## Per-task Verification Map
+
+| task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 02-01-01 | 01 | 1 | BACK-04 | API | `pytest tests/test_api.py::test_list_files -v` | ⚠️ W0 | ⬜ pending |
+| 02-01-02 | 01 | 1 | FILE-01 | API | `pytest tests/test_api.py::test_get_file_contents -v` | ⚠️ W0 | ⬜ pending |
+| 02-01-03 | 01 | 1 | FILE-04 | API | `pytest tests/test_api.py::test_delete_file -v` | ⚠️ W0 | ⬜ pending |
+| 02-02-01 | 02 | 1 | FILE-02 | UI | Browser test or manual | - | ⬜ pending |
+| 02-02-02 | 02 | 1 | FILE-03 | UI | Manual (touch scroll) | - | ⬜ pending |
+| 02-02-03 | 02 | 2 | FILE-05 | API | `pytest tests/test_api.py::test_export_tideda -v` | ⚠️ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `tests/conftest.py` — Flask test client fixture
+- [ ] `tests/test_api.py` — API endpoint stubs for:
+  - `test_list_files`
+  - `test_get_file_contents`
+  - `test_delete_file`
+  - `test_export_tideda`
+- [ ] `tests/__init__.py` — Package marker
+
+*Existing Flask test client pattern from src/app.py can be reused.*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| File list scroll navigation | FILE-03 | Touch UI interaction | Visit /files, scroll through list |
+| File content display formatting | FILE-02 | Visual verification | Click file, verify content renders |
+| Delete confirmation dialog | FILE-04 | UX flow | Click delete, verify confirmation |
+| tidEDA export download | FILE-05 | File download | Click export, verify file downloads |
+
+*These require browser/UI interaction that automated tests don't reliably capture.*
+
+---
+
+## Validation Sign-Off
+
+- [ ] All tasks have `<automated>` verify or Wave 0 dependencies
+- [ ] Sampling continuity: no 3 consecutive tasks without automated verify
+- [ ] Wave 0 covers all MISSING references
+- [ ] No watch-mode flags
+- [ ] Feedback latency < 30s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending
+