# Batch Report

**Batch**: 89
**Tasks**: AZ-446 (CSV reporter refinements — trend-line + acceptance-band annotations + Monte Carlo CI)
**Date**: 2026-05-17
**Cycle**: 1
**Complexity**: 2 points

## Task Results

| Task | Status | Files Modified | Tests | AC Coverage | Issues |
|------|--------|----------------|-------|-------------|--------|
| AZ-446_csv_reporter_refinements | Done | 1 source (nfr_recorder), 2 scenarios (nft_res_03 + nft_perf_01), 1 unit test (test_nfr_recorder) | pass | 3/3 | F1 Low (CI naming semantics, in-scope), F2 Medium (carry-over from batch 88, not in scope) |

## AC Test Coverage: All covered (3 of 3 ACs)

## Code Review Verdict: PASS_WITH_WARNINGS

See `_docs/03_implementation/reviews/batch_89_review.md`. 0 Critical / 0 High / 1 Medium (cumulative-review carry-over from batches 85–88: `write_csv_evidence` + `_resolve_fixture_path` duplication is outside AZ-446 scope — surfaces again at the next cumulative review) / 1 Low (empirical-CI naming semantics, documented in nfr_recorder docstring).

## Auto-Fix Attempts: 0

## Stuck Agents: None

## Test Results

- `e2e/_unit_tests/reporting/test_nfr_recorder.py` — 14 tests pass (8 pre-existing + 6 new for AZ-446 band/CI behavior).
- Full e2e unit-test suite: **1229 passed in 134 s** (+6 vs. batch 88).
- No scenario-level regressions: NFT-RES-03 + NFT-PERF-01 scenarios continue to skip cleanly via `sitl_replay_ready` / `tier2_only` gating in the Tier-1 docker harness.

## API Change Summary

`_NfrRecorder.record_metric` (and the underlying `_RunAggregator`):

```python
record_metric(
    name, value, ac_id=None, *,
    band: str | None = None,
    ci95_low: float | None = None,
    ci95_high: float | None = None,
)
```

- All new params kw-only, default `None` — fully backwards compatible.
- Unbalanced `ci95_*` → `ValueError`.

New artifact:

- `<evidence_dir>/report.csv` (one row per (scenario, metric)) —
  columns: `scenario_id, metric_name, value, value_band, ci95_low,
  ci95_high, ac_id, outcome`. Emitted once per pytest session by
  `_PluginHooks.pytest_sessionfinish` (AC-3).

`regression-baseline.json` schema is unchanged (flat `{metric:
numeric}`) to preserve the diff contract used by regression-detection
tooling.

## Next Batch: None — all selected test-implementation tasks are done (Step 10 Implement Tests complete for cycle 1).