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+---
+phase: 3
+slug: pipeline-integration-and-mvp
+status: draft
+nyquist_compliant: false
+wave_0_complete: false
+created: 2026-03-26
+---
+
+# Phase 3 — Validation Strategy
+
+> Per-phase validation contract for feedback sampling during execution.
+
+---
+
+## Test Infrastructure
+
+| Property | Value |
+|----------|-------|
+| **Framework** | Go standard `testing` package |
+| **Config file** | none — `go test ./...` convention |
+| **Quick run command** | `go test ./classify/... ./synth/... ./cmd/... -count=1` |
+| **Full suite command** | `go test ./... -count=1` |
+| **Estimated runtime** | ~5 seconds |
+
+---
+
+## Sampling Rate
+
+- **After every task commit:** Run `go test ./classify/... ./synth/... -count=1`
+- **After every plan wave:** Run `go test ./... -count=1`
+- **Before `/gsd:verify-work`:** Full suite must be green
+- **Max feedback latency:** 5 seconds
+
+---
+
+## Per-Task Verification Map
+
+| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
+|---------|------|------|-------------|-----------|-------------------|-------------|--------|
+| 03-01-01 | 01 | 1 | CLAS-02 | unit | `go test ./classify/... -run TestHashBucketDistribution -count=1` | ❌ W0 | ⬜ pending |
+| 03-01-02 | 01 | 1 | CLAS-02 | unit | `go test ./classify/... -run TestAllClassesCount -count=1` | ❌ W0 | ⬜ pending |
+| 03-01-03 | 01 | 1 | CLAS-02 | unit | `go test ./classify/... -run TestClassifyUnknown -count=1` | ✅ update | ⬜ pending |
+| 03-01-04 | 01 | 1 | CLAS-02 | unit | `go test ./synth/... -run TestNewBankHas11Layers -count=1` | ✅ update | ⬜ pending |
+| 03-01-05 | 01 | 1 | CLAS-02 | unit | `go test ./synth/... -run TestClassFreqConfigsComplete -count=1` | ❌ W0 | ⬜ pending |
+| 03-02-01 | 02 | 2 | CAPT-03 | integration | `go test ./encode/... -run TestMP3Valid -count=1` | ✅ | ⬜ pending |
+| 03-02-02 | 02 | 2 | CAPT-03 | manual | `sudo ./netsynth -i lo -o /tmp/test.mp3` | N/A | ⬜ pending |
+
+*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*
+
+---
+
+## Wave 0 Requirements
+
+- [ ] `classify/classifier_test.go` — `TestHashBucketDistribution` covering all 4 bucket outputs
+- [ ] `classify/types_test.go` (or `classifier_test.go`) — `TestAllClassesCount` asserting 14 classes, no `ClassUnknown`
+- [ ] `synth/config_test.go` — `TestClassFreqConfigsComplete` asserting every class in `AllClasses()` has a `FreqConfig` entry
+- [ ] Update `synth/bank_test.go:TestNewBankHas11Layers` → assert `14` (not `11`)
+- [ ] Update `classify/classifier_test.go:TestClassifyUnknown` → assert `unknown-` prefix, not removed `ClassUnknown` constant
+
+---
+
+## Manual-Only Verifications
+
+| Behavior | Requirement | Why Manual | Test Instructions |
+|----------|-------------|------------|-------------------|
+| Encoding status messages (Encoding.../Saved...) printed to stderr | CAPT-03 | CLI output format is presentation, not logic | Build binary, run `sudo ./netsynth -i lo -o /tmp/test.mp3`, generate traffic, Ctrl+C. Verify stderr shows "Encoding..." then "Saved..." with path, duration, size, encoding time. |
+| MP3 reflects actual traffic mix — different sessions sound different | CAPT-03 | Perceptual audio quality requires human listening | Run two sessions with different traffic profiles (e.g., DNS-heavy vs HTTPS-heavy). Play both MP3s. Verify they sound distinct. |
+
+---
+
+## 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 < 5s
+- [ ] `nyquist_compliant: true` set in frontmatter
+
+**Approval:** pending