yoloyolo/.planning/phases/03-pipeline-integration-and-mvp/03-01-SUMMARY.md

phase, plan, subsystem, tags, dependency_graph, tech_stack, key_files, decisions, metrics

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics
03-pipeline-integration-and-mvp	01	classify, synth	classification type-system hash-bucketing audio-synthesis tdd	requires provides affects 14-class-type-system hash-bucketed-unknowns synth-config-14-layers classify synth encode aggregate	added patterns hash-bucketing deterministic-routing additive-synthesis	created modified synth/config_test.go (new test functions TestClassFreqConfigsComplete, TestNumLayersMatchesAllClasses) classify/types.go classify/classifier.go classify/classifier_test.go synth/bank_test.go synth/config.go synth/config_test.go	hashBucket uses (dstPort*31 + protoNum*7) % 4 for deterministic bucket assignment TestHashBucketDistribution uses minimal custom rules (not DefaultRules) because DefaultRules catch-all OtherTCP/OtherUDP prevent hashBucket from ever being reached Tasks 1 and 2 committed together hashBucket stub and config.go required simultaneous update for compilation	duration completed tasks_completed files_modified ~15min 2026-03-26T12:11:30Z 2 6

Phase 03 Plan 01: Extend TrafficClass to 14 Classes with Hash-Bucketed Unknowns Summary

One-liner: Replace single ClassUnknown with 4 hash-bucketed ClassUnknown1-4 classes (850-1100 Hz dissonant range), updating AllClasses() to 14 elements and synth config to match.

What Was Built

Extended the traffic classification type system from 11 classes to 14 by replacing ClassUnknown TrafficClass = "unknown" with four deterministically-assigned unknown buckets. Unrecognized packets are now routed via hashBucket(dstPort, protocol) using a simple hash formula, ensuring each bucket gets a statistically even distribution of unrecognized traffic and produces a distinct dissonant drone tone.

Key Changes

classify/types.go:

• Removed ClassUnknown TrafficClass = "unknown"
• Added ClassUnknown1-4 TrafficClass = "unknown-[1-4]"
• AllClasses() now returns 14 elements

classify/classifier.go:

• Replaced all ClassUnknown return sites with hashBucket(dstPort, protocol) calls
• Added hashBucket() function: h := uint32(dstPort)*31 + uint32(protoNum)*7; switch h % 4
• ARP/non-transport packets route to ClassUnknown1 (dstPort=0, protocol="" -> h=0)

synth/config.go:

• NumLayers = 14 (was 11)
• GainPerLayer = 1.0/14 ≈ 0.0714 (was ≈0.0909)
• Replaced classify.ClassUnknown entry (437 Hz) with 4 entries in 850-1100 Hz range:
  • ClassUnknown1: 862 Hz, pan=+0.6
  • ClassUnknown2: 920 Hz, pan=-0.6
  • ClassUnknown3: 981 Hz, pan=+0.9
  • ClassUnknown4: 1047 Hz, pan=-0.9

Tests added/updated:

• classify/classifier_test.go: TestAllClassesCount, TestHashBucketDistribution, updated TestClassifyUnknown
• synth/bank_test.go: Renamed TestNewBankHas14Layers (was 11), updated TestMixerNoClip for 14 classes
• synth/config_test.go: Added TestClassFreqConfigsComplete, TestNumLayersMatchesAllClasses; updated range check to 1100 Hz

Commits

Task	Commit	Description
Tasks 1+2	ff3ec7e	feat(03-01): extend TrafficClass to 14 classes with hash-bucketed unknowns

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] TestHashBucketDistribution required custom rules, not DefaultRules

• Found during: Task 1 (RED phase verification)
• Issue: The plan specified classify.NewClassifier(classify.DefaultRules) in TestHashBucketDistribution. DefaultRules includes catch-all {Protocol: "tcp", DstPort: 0, Class: ClassOtherTCP} and {Protocol: "udp", DstPort: 0, Class: ClassOtherUDP} rules. These catch all unrecognized TCP/UDP ports before they reach hashBucket, so the test could never produce unknown-* classes.
• Fix: Changed TestHashBucketDistribution to use a minimalRules slice with only ICMP and HTTPS rules — no catch-all — so unmatched ports do reach hashBucket.
• Files modified: classify/classifier_test.go
• Commit: ff3ec7e

2. [Rule 3 - Blocking] Tasks 1 and 2 implemented together

• Found during: Task 1 (go vet verification)
• Issue: The plan's TDD structure had Task 1 write tests and Task 2 implement. However, Task 1's changes to types.go (removing ClassUnknown) immediately broke classifier.go and config.go compilation. go vet (Task 1's acceptance criterion) requires compilation.
• Fix: Implemented hashBucket and synth/config.go changes (Task 2 scope) during Task 1 to make compilation succeed. All Task 2 acceptance criteria were met simultaneously.
• Commit: Single commit ff3ec7e covers both tasks.

3. [Rule 2 - Missing] TestFrequenciesInRange range expanded to 1100 Hz

• Found during: Task 2
• Issue: Existing TestFrequenciesInRange enforced BaseHz <= 800 Hz. New unknown classes use 850-1047 Hz range, which would fail this check.
• Fix: Updated range to cfg.BaseHz < 60 || cfg.BaseHz > 1100 with a comment explaining the D-05 unknown bucket range.
• Files modified: synth/config_test.go
• Commit: ff3ec7e

Test Results

ok  github.com/netsynth/netsynth/classify  0.013s
ok  github.com/netsynth/netsynth/synth     0.855s
ok  github.com/netsynth/netsynth/aggregate 0.144s
ok  github.com/netsynth/netsynth/capture   0.007s
ok  github.com/netsynth/netsynth/encode    0.307s
ok  github.com/netsynth/netsynth/cmd/netsynth 0.007s

All 6 packages pass. No regressions.

Known Stubs

None. All 14 classes have FreqConfig entries and the classifier routes all packet types deterministically.

Self-Check: PASSED