docs(phase-19.6.1): add validation strategy

.planning/phases/19.6.1-backend-administrators-screen/19.6.1-VALIDATION.md

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+---
+phase: "19.6.1"
+slug: "backend-administrators-screen"
+# status lifecycle: draft (seeded by plan-phase) → validated (set by validate-phase §6)
+# audit-milestone §5.5 distinguishes NOT-VALIDATED (draft) from PARTIAL (validated + nyquist_compliant: false) (#2117)
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: "2026-10-21"
+---
+
+# Phase 19.6.1 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Go `testing`; testcontainers-go Postgres via `adminGorm(t)` (skips under `-short`) |
+| **Config file** | none — package helpers `adminGorm`, `adminHandler`, `insertAdmin` in `modules/cabana/auth_test.go` |
+| **Quick run command** | `go vet ./modules/cabana ./modules/pact && go test -short ./modules/cabana ./modules/pact ./modules/surf` |
+| **Full suite command** | `go vet ./... && go test ./... && (cd examples/hello && go test ./...) && go test ./cmd/summer -run TestDocsTree && go run ./cmd/summer docs:build --check` |
+| **Estimated runtime** | ~180 seconds (Docker-backed) |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run the quick run command
+- **After every plan wave:** `go test ./modules/cabana ./modules/surf` (Docker) + `cd examples/hello && go test ./...`
+- **Before `/msd-verify-work`:** Full suite must be green
+- **Max feedback latency:** 180 seconds
+
+---
+
+## Per-Task Verification Map
+
+Filled by the planner per task; the decision → test map lives in `19.6.1-RESEARCH.md` § Validation Architecture.
+
+| Task ID | Plan | Wave | Requirement | Threat Ref | Secure Behavior | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|------------|-----------------|-----------|-------------------|-------------|--------|
+| 19.6.1-01-* | 01 | 1 | D-03..D-17 | T-19.6.1-* | privilege rules enforced server-side | smoke | per plan | ❌ W0 | ⬜ pending |
+| 19.6.1-02-* | 02 | 2 | D-03..D-17 | T-19.6.1-* | privilege rules covered by tests | unit/Postgres | per plan | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `modules/cabana/backend_screens_test.go` — activation and schema (`-short`)
+- [ ] `modules/cabana/action_extensions_test.go` — D-14 boot and run
+- [ ] `modules/cabana/backend_privileges_internal_test.go` — subset/ceiling helpers (`package cabana`)
+- [ ] `modules/cabana/administrators_postgres_test.go` — D-03..D-12 at HTTP level
+- [ ] `modules/cabana/roles_postgres_test.go` — D-16/D-17
+- [ ] superuser-capable `insertAdmin` helper
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Administrators/Roles screens render and save in the admin SPA | SC-1 | visual SPA check | log in as superuser and as a limited admin, open Settings → Administrators / Roles, create, edit, deactivate |
+
+---
+
+## 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 < 180s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending