# Rustdoc Foundation Review

Issue: #25
Branch: `docs/issue-25-rustdoc`
Date: 2026-06-10

## Scope

Reviewed Rustdoc-only changes across:

- `crates/core/src/error.rs`
- `crates/core/src/hex.rs`
- `crates/core/src/number.rs`
- `crates/core/src/string.rs`
- `crates/logging/src/capture.rs`
- `crates/logging/src/correlation.rs`
- `crates/logging/src/subscriber.rs`
- `crates/test/src/async_assert.rs`
- `crates/test/src/concurrent.rs`
- `crates/test/src/temp_dir.rs`

## 7-Tier Review

### Tier 1 - Contract Accuracy

PASS. `# Errors` sections match the implemented `Result` branches:

- Range helpers document invalid range, out-of-range, and non-finite float paths.
- String helpers document empty, blank, and negative byte-limit paths.
- Logging subscriber builders document environment/filter parse failures.
- Test helpers document invalid bounds, operation failures, and join/thread failures.

### Tier 2 - Rustdoc Compile Reliability

PASS. All added doctests compile and run under `cargo test --workspace`.

### Tier 3 - Panic And Safety Accuracy

PASS. No `# Safety` sections were added because the public API does not expose unsafe functions or unsafe traits. `# Panics` is limited to `CapturedLogs` methods that call `Mutex::lock().expect(...)`.

### Tier 4 - Public API Behavior

PASS. The diff adds documentation only. No function bodies, type definitions, dependency declarations, or feature flags were changed.

### Tier 5 - Library User Experience

PASS. Examples cover common use cases for validation helpers, correlation IDs, capture subscribers, async assertions, concurrency testers, and temporary directories.

### Tier 6 - Validation Evidence

PASS.

- `git diff --check`
- `cargo fmt --all --check`
- `cargo test --workspace`
- `cargo clippy --workspace --all-targets --all-features -- -D warnings`
- `cargo doc --workspace --no-deps`
- `RUSTDOCFLAGS='-D warnings' cargo doc --workspace --no-deps`

### Tier 7 - External Review

PARTIAL. A Codex native `code-reviewer` subagent was started for read-only review, but the agent failed with a network stream error before completion. Local 7-Tier review was completed instead, and stricter rustdoc warning validation passed.

## Findings

No P0/P1/P2/P3 findings.

## Verdict

PASS.

P0 count: 0
P1 count: 0

Remaining risk: external subagent review was unavailable due to transport failure, but local review plus doctest, clippy, and rustdoc warning gates passed.
