# Issue #83 Step 6-R Review

Scope: `issue-83-compression-benchmark-report` against `develop`.

Baseline: `90a937f5f422d020253749e6188eac2f2a623a1a`.

## Reviewed Surface

- `crates/compression`
- root facade `compression*` features
- `benchmark/compression-benchmark`
- `docs/benchmark`
- `docs/images/readme-charts`
- `README.md`, `README.ko.md`, `WIP.md`, `CHANGELOG.md`

## Subagent Lanes

| lane | role | final result | notes |
|---|---|---|---|
| Rust/API | `code-reviewer` | `P0=0 P1=0` | Initial P2 default fallback/docs polish were fixed. |
| Tests | `test-engineer` | `P0=0 P1=0` | Added no-default feature validation and benchmark helper tests. |
| Benchmark | `performance-reviewer` | `P0=0 P1=0` | Added fixture manifest, metadata, normalized CSV schema, MiB/s units, and snapshot caveats. |
| Docs/API UX | `library-user-reviewer` | `P0=0 P1=0` | Fixed non-existent API examples and unreleased install guidance. |
| Security/Supply chain | `security-reviewer` | `P0=0 P1=0` | Empty compression defaults, explicit root feature forwarding, no local SVG font-file paths. |
| Final verifier | `verifier` | `P0=0 P1=0` | Confirmed pre-PR evidence requirements; this artifact and lesson complete the remaining tracked-doc gap. |

## Local Validation Evidence

- `cargo fmt --all --check`
- `git diff --check`
- `cargo test -p bluetape-rs-compression --no-default-features --locked`
- `cargo test -p bluetape-rs-compression --all-features --locked`
- `cargo test -p bluetape-rs-compression compiled_algorithms_round_trip_stays_stable_across_threads --all-features --locked`
- `cargo test -p compression-benchmark --locked`
- `cargo test --workspace --all-features --locked`
- `cargo clippy --workspace --all-targets --all-features --locked -- -D warnings`
- `RUSTDOCFLAGS="-D warnings" cargo doc --workspace --all-features --no-deps --locked`
- `cargo audit --file Cargo.lock`
- Single-feature checks for `gzip`, `zlib`, `deflate`, `zstd`, `lz4`, `snappy`
- Root facade checks for `compression`, `compression-*`, and `compression-all`
- CSV schema check for normalized `mib_s` and `timing_provenance`
- `xmllint --noout` for generated SVG charts
- PNG visual inspection for throughput and ratio charts

## Gate Verdict

`P0=0 P1=0`

Step 6-R local/native 7-Tier review passes for PR creation.

## Step 7-R Post-PR Review

Post-PR lanes:

- `code-reviewer`: initially found `P0=0 P1=1 P2=1`.
- `verifier`: initially found `P0=0 P1=0`, with missing GitHub PR review/comment evidence.

Repairs:

- Added tracked Go benchmark harness under `benchmark/compression-benchmark/go`.
- Added tracked raw Go benchmark capture under
  `docs/benchmark/raw/go-same-condition.txt`.
- Switched the CSV normalizer to read the repo-local raw Go capture instead of
  the earlier temporary raw-output path.
- Documented the fixture generation and Go raw-output capture commands in
  `docs/benchmark/compression-same-condition-metadata.md`.
- Added typed `CompressionError::UnsupportedLevel` for zstd custom levels that
  do not fit `i32`, plus a regression test.
- Split `crates/compression/src/lib.rs` into facade-only exports plus dedicated
  `config`, `error`, `traits`, `registry`, and `adapters/*` modules.
- Moved compression behavior tests out of `lib.rs` into
  `crates/compression/tests/compression.rs`.
- Added bounded multi-thread stress coverage for compiled compression
  algorithms.
- Marked `CompressionConfig` as `#[non_exhaustive]`, added
  `CompressionConfig::new()` and `with_level(...)`, and updated examples to
  avoid public struct-literal coupling.
- Changed registry dispatch to use the internal `adapters` module instead of
  relying on facade re-exports.
- Made `lz4` and `snappy` reject explicit non-default levels with
  `CompressionError::UnsupportedLevel`.

Additional validation:

- Fixture generator output matches all 12 rows in
  `docs/benchmark/compression-fixtures-manifest.csv`.
- Go benchmark harness emits the expected 151-line `testing.B` raw output.
- `cargo test -p bluetape-rs-compression --no-default-features --features zstd --locked`
  passes and covers zstd level rejection.
- `cargo test -p bluetape-rs-compression --no-default-features --locked` and
  `cargo test -p bluetape-rs-compression --all-features --locked` pass after
  module/test separation.
- `cargo test -p bluetape-rs-compression compiled_algorithms_round_trip_stays_stable_across_threads --all-features --locked`
  passes after adding bounded multi-thread stress coverage.
- `cargo clippy -p bluetape-rs-compression --all-targets --all-features --locked -- -D warnings`
  passes after module/test separation.
- Single-feature matrix for `gzip`, `zlib`, `deflate`, `zstd`, `lz4`, and
  `snappy` passes after API-boundary repairs.

Post-repair Step 7-R blocker status: `P0=0 P1=0`.
