Documentation: comprehensive mdbook rewrite, rustdoc fixes, and test stability

[unclesp1d3r]

Summary

Closes #23

• Rewrote all major mdbook chapters (library-api, cli-usage, output, configuration, performance) to accurately document the implemented API, CLI, and architecture -- replacing placeholder/thin content with comprehensive references
• Updated introduction.md, getting-started.md, and migration.md with current project status, correct code examples, and C-to-Rust API mapping table
• Fixed 3 rustdoc link warnings in src/parser/loader.rs (unresolved parse_text_magic_file references)
• Added architecture constraints and mise toolchain notes to AGENTS.md
• Fixed flaky test_file_buffer_binary_content caused by temp file name collisions under parallel coverage execution (replaced timestamp-based rand with atomic counter)

Test plan

• cargo doc -- 0 warnings
• cargo test --doc -- 118 passed, 0 failed
• cargo test -- 940+ tests pass
• cargo clippy -- -D warnings -- clean
• mdbook build docs/ -- successful
• just ci-check -- fully green (including coverage)
• Verify rendered mdbook site looks correct
• Verify GitHub Actions CI passes

Generated with Claude Code

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Caution

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Summary by CodeRabbit

Release Notes

• Documentation

  • Added comprehensive CLI usage guide with examples, flags, exit codes, and stdin support
  • Published full library API reference with configuration, error types, and presets
  • Documented configuration system with validation and security bounds
  • Added performance optimization and benchmarking guidance
  • Expanded output formatters documentation for text and JSON formats

• Tests

  • Improved deterministic temp file naming for test suite

Walkthrough

Comprehensive documentation update covering Phase 1 MVP, including rewritten mdbook chapters (CLI usage, library API, configuration, output formatters, performance), updated introduction and migration guide, plus minor code changes to temp file naming and documentation references.

Changes

Cohort / File(s)	Summary
Documentation: Core API & Getting Started docs/src/library-api.md, docs/src/configuration.md, docs/src/getting-started.md	Complete rewrite of library API reference with MagicDatabase, EvaluationConfig structs and associated methods; configuration reworked from planned to API-first with field-level defaults, bounds, and presets (default/performance/comprehensive); getting-started updated with prerequisites and code examples.
Documentation: CLI, Migration & Introduction docs/src/cli-usage.md, docs/src/migration.md, docs/src/introduction.md	CLI documentation expanded from placeholder with args, flags, output formats, stdin support, and examples; migration guide updated with API mapping table and error handling examples; introduction enhanced with "What's Complete" and "Next Milestones" sections reflecting new features (MIME types, timeout, presets, tag extraction).
Documentation: Output, Performance & Architecture docs/src/output.md, docs/src/performance.md, docs/src/AGENTS.md	Output formatters rewritten as Chapter 9 with tag enrichment, JSON/text formatting pipeline, and serialization details; performance documentation replaces notes with optimizations (memory-mapped I/O, SIMD, benchmarking); AGENTS.md adds architecture constraints and standard command guidance.
Code: Test Infrastructure & Parser Documentation src/io/mod.rs, src/parser/loader.rs	Temp file naming replaced with deterministic monotonic AtomicU64 counter (eliminating rand module); loader.rs documentation references corrected to point to super::parse_text_magic_file().

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~30 minutes

Possibly related PRs

• Test infrastructure, compatibility tests, and architecture improvements #31: Refactors parser loader and io temp-file code paths that this PR documents and corrects.
• feat: Implement text magic parser (issue #11) #16: Implements parse_text_magic_file() function in src/parser/mod.rs that loader.rs documentation references are updated to point to.
• feat: parser integration, CI modernization with mise, and Dev Container support #26: Expands parser/load API and related parser functions that are now documented in the updated library-api and migration guides.

Suggested labels

documentation, testing, parser, io, size:XXL

Poem

🐰 Hops through docs with glee and care,
APIs documented everywhere!
From CLI flags to config presets bright,
And temp files named just right!
The MVP hops on stage complete—
Documentation can't be beat! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the primary changes: comprehensive mdbook documentation rewrite, rustdoc link fixes, and test stability improvements from replacing random temp filenames with atomic counter.
Description check	✅ Passed	The description clearly relates to the changeset, detailing all major documentation updates, specific file modifications, rustdoc fixes, and the test stability improvement with atomic counter implementation.
Linked Issues check	✅ Passed	All primary objectives from issue #23 are met: comprehensive rustdoc documentation (library-api, cli-usage, configuration), mdbook site rewrite (getting-started, introduction, migration, output, performance chapters), rustdoc link warnings fixed, and test stability improved. Cargo doc, cargo test --doc, and mdbook build all pass.
Out of Scope Changes check	✅ Passed	All changes align with issue #23 scope: documentation rewrites, rustdoc fixes, and test stability. The atomic counter fix for temp files is a direct support for testing documentation examples and aligns with MVP quality assurance.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 23-documentation-rustdoc-mdbook-site-migration-guide

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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