dev-stress 0.9.0

High-load stress testing for Rust. Concurrency, volume, saturation. Part of the dev-* verification suite.
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# Changelog

## [Unreleased]

## [0.9.0] - 2026-05-08

### Added

#### Adoption of dev-report 0.9

- Bumped `dev-report` dep to `0.9`.
- `into_check_result` and the new `compare_with_options` now emit `CheckResult`s tagged `stress` and carrying numeric `Evidence` for `iterations`, `threads`, `ops_per_sec`, `thread_time_cv`, `total_elapsed_ms`. Latency percentiles and baselines add their own labeled evidence.
- Regression checks additionally carry the `regression` tag.

#### Latency percentiles (v0.2 milestone)

- New `LatencyTracker` for thread-local sampling at a configurable rate.
- `LatencyStats { p50, p95, p99, samples_count }` computed losslessly.
- `StressRun::track_latency(rate)` opts into per-op tracking.
- `StressResult::latency: Option<LatencyStats>`.
- `CompareOptions::baseline_p99` / `p99_regression_pct_threshold` for tail-latency regression detection.

#### Soak tests (v0.3 milestone)

- New `SoakRun` builder bounded by `total_duration` + `checkpoint_interval`.
- `SoakCheckpoint` records `at_offset`, `window_iters`, `window_duration`, `ops_per_sec` per window.
- `SoakResult::checkpoint_ops_cv` for stability across windows.
- `SoakResult::into_check_result(degradation_pct_threshold)` flags degradation between first-half and second-half mean ops/sec. Tagged `stress` + `soak`.

#### System stats (v0.4 + v0.5 milestones, opt-in)

- `system-stats` feature flag (off by default; pulls `sysinfo`).
- `SystemSampler` for repeated RSS + CPU-time captures of the current process.
- `SystemStats::compare(name, before, after, peak_rss_threshold)` returns a `CheckResult` tagged `stress` + `system`.

#### Producer integration

- `StressProducer<F>` adapter implementing `dev_report::Producer`.
- `StressResult::into_report(version, &CompareOptions)` shortcut.
- `CompareOptions` struct configuring `baseline_ops_per_sec`, `ops_drop_pct_threshold`, `baseline_p99`, `p99_regression_pct_threshold`.

#### Builder ergonomics

- `StressRun::iterations_planned` / `threads_planned` accessors.
- `StressRun::track_latency(rate)`.
- `SoakRun::duration` / `checkpoint` / `threads` / `track_latency`.

### Documentation

- All public items have rustdoc with at least one example.
- REPS.md expanded: §4 (latency percentiles definitions), §5 (verdict semantics + required evidence list), §6 (soak tests), §7 (system stats feature), §8 (producer integration).

[0.9.0]: https://github.com/jamesgober/dev-stress/releases/tag/v0.9.0

## [0.1.0] - 2026-05-07

### Added

- Initial crate skeleton.
- `Workload` trait with concurrency-safe `run_once`.
- `StressRun` builder with iterations + threads configuration.
- `StressResult` with `ops_per_sec` and `thread_time_cv` (coefficient
  of variation across thread elapsed times).
- `into_check_result` integration with `dev-report`.
- Smoke tests covering basic execution and verdict integration.

### Note

Name-claim release. Real load patterns (latency percentiles per-op,
soak tests, memory pressure) land in `0.2.x` and beyond.

[Unreleased]: https://github.com/jamesgober/dev-stress/compare/v0.9.0...HEAD
[0.1.0]: https://github.com/jamesgober/dev-stress/releases/tag/v0.1.0