chore: add docstring coverage and update docs version

[shenxianpeng]

Summary

• Add missing module and function docstrings under cpp_linter_hooks to satisfy docstring coverage.
• Update README and CMake example pre-commit rev references to v1.4.2 for the next release.

Validation

• uv run ruff check
• uv run ruff format --check
• uv run pytest -q (113 passed)
• AST docstring scan: 34/34 documented (100.00%)

Fixes #227

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.07%. Comparing base (7fc3b20) to head (969742a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #230   +/-   ##
=======================================
  Coverage   97.07%   97.07%           
=======================================
  Files           4        4           
  Lines         239      239           
=======================================
  Hits          232      232           
  Misses          7        7           

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8fdf2a8d-cac7-4946-ace6-579690467466

📥 Commits

Reviewing files that changed from the base of the PR and between 7fc3b20 and 969742a.

📒 Files selected for processing (6)

• README.md
• cpp_linter_hooks/__init__.py
• cpp_linter_hooks/clang_format.py
• cpp_linter_hooks/clang_tidy.py
• cpp_linter_hooks/util.py
• examples/cmake/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/docstring-coverage-v1.4.2-docs

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