docs(phase-17): add research and validation strategy

.planning/phases/17-group-expansion-html-reports/17-VALIDATION.md

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+---
+phase: 17
+slug: group-expansion-html-reports
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-04-09
+---
+
+# Phase 17 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | xUnit + Moq (existing) |
+| **Config file** | SharepointToolbox.Tests/SharepointToolbox.Tests.csproj |
+| **Quick run command** | `dotnet test --filter "Category!=Integration"` |
+| **Full suite command** | `dotnet test` |
+| **Estimated runtime** | ~15 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `dotnet test --filter "Category!=Integration"`
+- **After every plan wave:** Run `dotnet test`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 15 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 17-01-01 | 01 | 1 | RPT-01, RPT-02 | unit | `dotnet test --filter "SharePointGroupResolver"` | ❌ W0 | ⬜ pending |
+| 17-02-01 | 02 | 2 | RPT-01 | unit | `dotnet test --filter "HtmlExportService"` | ✅ | ⬜ pending |
+| 17-02-02 | 02 | 2 | RPT-01 | unit | `dotnet test --filter "HtmlExportService"` | ✅ | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `SharepointToolbox.Tests/Services/SharePointGroupResolverTests.cs` — stubs for RPT-01, RPT-02
+- [ ] Test fixtures for `ResolvedMember` and mock group data
+
+*If none: "Existing infrastructure covers all phase requirements."*
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Click group pill expands member list in browser | RPT-01 | Requires rendered HTML + browser interaction | Export HTML, open in browser, click group pill, verify member sub-row appears |
+| "members unavailable" label renders on resolution failure | RPT-01 | Visual verification in browser | Export with mocked failure, verify italic label appears |
+
+---
+
+## 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 < 15s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending