docs(02): add research and validation strategy

.planning/phases/02-agent-features/02-VALIDATION.md

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+---
+phase: 2
+slug: agent-features
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-23
+---
+
+# Phase 2 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | pytest 8.x + pytest-asyncio (existing from Phase 1) |
+| **Config file** | `pyproject.toml` (existing `[tool.pytest.ini_options]`) |
+| **Quick run command** | `pytest tests/unit -x -q` |
+| **Full suite command** | `pytest tests/ -x` |
+| **Estimated runtime** | ~45 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `pytest tests/unit -x -q`
+- **After every plan wave:** Run `pytest tests/ -x`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 45 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 02-01-xx | 01 | 1 | AGNT-02 | unit | `pytest tests/unit/test_memory_short_term.py -x` | ❌ W0 | ⬜ pending |
+| 02-01-xx | 01 | 1 | AGNT-03 | integration | `pytest tests/integration/test_memory_long_term.py -x` | ❌ W0 | ⬜ pending |
+| 02-02-xx | 02 | 1 | AGNT-04 | unit | `pytest tests/unit/test_tool_registry.py tests/unit/test_tool_executor.py -x` | ❌ W0 | ⬜ pending |
+| 02-02-xx | 02 | 1 | AGNT-06 | integration | `pytest tests/integration/test_audit.py -x` | ❌ W0 | ⬜ pending |
+| 02-03-xx | 03 | 2 | CHAN-03 | unit | `pytest tests/unit/test_whatsapp_verify.py tests/unit/test_whatsapp_normalize.py -x` | ❌ W0 | ⬜ pending |
+| 02-03-xx | 03 | 2 | CHAN-04 | unit | `pytest tests/unit/test_whatsapp_scoping.py -x` | ❌ W0 | ⬜ pending |
+| 02-04-xx | 04 | 2 | AGNT-05 | unit+integ | `pytest tests/unit/test_escalation.py tests/integration/test_escalation.py -x` | ❌ W0 | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `tests/unit/test_memory_short_term.py` — AGNT-02: Redis sliding window
+- [ ] `tests/integration/test_memory_long_term.py` — AGNT-03: pgvector retrieval + tenant isolation
+- [ ] `tests/unit/test_tool_registry.py` — AGNT-04: tool registry lookup
+- [ ] `tests/unit/test_tool_executor.py` — AGNT-04: schema validation + confirmation
+- [ ] `tests/integration/test_audit.py` — AGNT-06: audit immutability
+- [ ] `tests/unit/test_escalation.py` — AGNT-05: transcript packaging
+- [ ] `tests/integration/test_escalation.py` — AGNT-05: DM delivery
+- [ ] `tests/unit/test_whatsapp_verify.py` — CHAN-03: webhook signature verification
+- [ ] `tests/unit/test_whatsapp_normalize.py` — CHAN-03: message normalization
+- [ ] `tests/unit/test_whatsapp_scoping.py` — CHAN-04: business-function gate
+- [ ] `tests/conftest.py` — extend with pgvector fixtures, mock MinIO (moto)
+- [ ] Install: `uv add --dev moto` (S3/MinIO mocking)
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| WhatsApp message delivery via live Cloud API | CHAN-03 | Requires Meta-verified WABA + phone number | Send test message to configured WhatsApp number, verify reply |
+| Media (image) round-trip via WhatsApp | CHAN-03 | Requires live WhatsApp + multimodal LLM | Send photo to agent, verify interpretation; request doc from agent |
+
+---
+
+## 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 < 45s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending