docs(01-03): complete aggregation and stats reporting plan

- Add 01-03-SUMMARY.md with window aggregator and formatting outcomes - Advance STATE.md plan counter to 3/4, update progress to 75% - Record execution metrics: 8min, 2 tasks, 4 files - Mark CLAS-03 and CLAS-04 requirements complete in REQUIREMENTS.md - Update ROADMAP.md phase 1 progress (3/4 summaries)
2026-03-25 12:19:04 +01:00
parent f2bebaf554
commit 31564ba0f5
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+---
+phase: 01-capture-and-classification
+plan: 03
+subsystem: aggregation
+tags: [go, channels, goroutines, time-windows, io-writer, stderr-output]
+
+# Dependency graph
+requires:
+  - phase: 01-capture-and-classification
+    provides: classify.ClassifiedPacket and classify.WindowSnapshot types from classify/types.go (Plan 01)
+
+provides:
+  - Ticker-driven Aggregate function reading ClassifiedPackets, emitting WindowSnapshots per time window
+  - PrintSummary for final per-protocol packet counts with percentages to io.Writer
+  - PrintWindowLine for verbose per-window activity output
+  - AccumulateTotals for merging snapshot counts into cumulative totals
+
+affects: [02-audio-synthesis, audio-engine-phase]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Aggregate pattern: done+events+ticker select loop with flush-on-done"
+    - "io.Writer injection for testable output (bytes.Buffer in tests, os.Stderr in main)"
+    - "Sorted output via sort.Strings on map keys for deterministic stderr display"
+
+key-files:
+  created:
+    - aggregate/window.go
+    - aggregate/window_test.go
+    - aggregate/summary.go
+    - aggregate/summary_test.go
+  modified: []
+
+key-decisions:
+  - "DefaultWindowMs=500: 500ms windows balance temporal resolution against snapshot frequency"
+  - "onSnapshot callback in Aggregate for optional verbose mode, nil-safe (no overhead when not verbose)"
+  - "io.Writer injection in PrintSummary/PrintWindowLine enables unit-test capture via bytes.Buffer and production use via os.Stderr"
+
+patterns-established:
+  - "Pattern: aggregate package bridges classify output to Phase 2 audio synthesis via WindowSnapshot channel"
+  - "Pattern: AccumulateTotals + PrintSummary separation keeps formatting logic independent of accumulation"
+
+requirements-completed: [CLAS-03, CLAS-04]
+
+# Metrics
+duration: 8min
+completed: 2026-03-25
+---
+
+# Phase 01 Plan 03: Aggregation and Stats Reporting Summary
+
+**Ticker-driven window aggregator with per-class packet counting, verbose per-window stdout lines, and sorted exit protocol summary — bridging packet classification to Phase 2 audio synthesis**
+
+## Performance
+
+- **Duration:** ~8 min
+- **Started:** 2026-03-25T11:15:42Z
+- **Completed:** 2026-03-25T11:23:00Z
+- **Tasks:** 2
+- **Files modified:** 4
+
+## Accomplishments
+
+- Aggregate goroutine accumulates ClassifiedPackets into time windows using done+events+ticker select loop, emitting WindowSnapshot per tick and flushing partial window on done
+- PrintSummary renders per-protocol packet counts with percentages and TOTAL line to any io.Writer, sorted alphabetically for deterministic output
+- PrintWindowLine renders per-window verbose activity line in "[window N] CLASS:count (total: N)" format
+- AccumulateTotals merges snapshot counts into cumulative totals for use with PrintSummary on exit
+- 11 unit tests total passing across both files (no race detector — CGO_ENABLED=0 environment)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Ticker-driven window aggregator** - `2a8fd7d` (feat)
+2. **Task 2: Exit summary and verbose window output** - `f2bebaf` (feat)
+
+**Plan metadata:** TBD (docs: complete plan)
+
+_Note: TDD tasks had test → feat commit pattern per task._
+
+## Files Created/Modified
+
+- `aggregate/window.go` - Aggregate function with done/events/ticker select loop and DefaultWindowMs constant
+- `aggregate/window_test.go` - 5 tests: EmitsSnapshot, MultipleClasses, DoneFlushesPartial, EmptyWindow, WindowIndex
+- `aggregate/summary.go` - PrintSummary, PrintWindowLine, AccumulateTotals functions
+- `aggregate/summary_test.go` - 6 tests: PrintSummary, PrintSummaryEmpty, PrintSummarySorted, PrintWindowLine, PrintWindowLineEmpty, AccumulateTotals
+
+## Decisions Made
+
+- DefaultWindowMs set to 500ms (0.5 seconds) — matches typical human perception granularity for network bursts without overwhelming snapshot channel
+- onSnapshot callback passed as nil-safe function pointer into Aggregate; main.go will set this to PrintWindowLine when --verbose flag is active, zero overhead otherwise
+- io.Writer interface chosen over os.Stderr hardcoding — allows test capture with bytes.Buffer while production code passes os.Stderr
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+One note: `-race` flag requires CGO_ENABLED=1, which is not available in this build environment. Tests were run without the race detector (`go test -v -count=1 ./aggregate/...`) and passed. The race-detector requirement from the plan verification section cannot be satisfied without CGO. This is a pre-existing environment constraint, not a code issue.
+
+## Issues Encountered
+
+- `go test -race` requires CGO_ENABLED=1 (LAME's CGo requirement). Environment has CGO_ENABLED=0. Tests ran and passed without -race flag.
+
+## User Setup Required
+
+None — no external service configuration required.
+
+## Next Phase Readiness
+
+- aggregate package ready for Phase 2 audio synthesis wiring
+- Aggregate output channel (WindowSnapshot) is the contract Phase 2 audio engine consumes
+- Main CLI (cmd/) will wire: capture → classify → Aggregate → audio synthesis, passing os.Stderr and --verbose flag to PrintWindowLine
+
+## Self-Check: PASSED
+
+All claimed files exist and both task commits are present in git history.
+
+---
+*Phase: 01-capture-and-classification*
+*Completed: 2026-03-25*