fix(tools): update QA tooling, rules, exclusions, and relative path logging

[Giom-V]

Summary of Changes

This PR refines the in-repo Quality Assurance and linting tools under tools/:

1. Table of Contents Link Checker (tools/check_readme_links.py):

   • Switched all path reporting, logging, and GitHub Actions warning annotations to use repository-relative paths (removing runner-specific absolute paths like /home/runner/work/cookbook/cookbook/).
   • Added EXCLUDED_README_NOTEBOOKS in tools/config.py to exempt notebooks that do not require Table of Contents entries (e.g. quickstarts/Authentication_with_OAuth.ipynb).

2. Linting Rules & Severity Handling (tools/nblint/):

   • Configured style::second_person and gemini::sdk_package as Severity.WARNING rather than build blockers.
   • Separated model selector format validation (errors on invalid syntax or missing default model) from ordering suggestions (warnings).
   • Expanded stub/redirect notebook detection in tools/config.py ("this notebook has moved").

3. Formatting Sanitization (tools/nbfmt/):

   • Added automatic cleanup of stray escaped newlines next to Colab badges (e.g. </a>\\n).

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on repository-wide maintenance and standardization. The primary goal is to ensure consistency across all Jupyter notebooks using the project's internal formatting and linting tools. Additionally, it improves developer documentation for these tools and cleans up repository ignore rules.

Highlights

• Notebook Formatting: Ran the in-repo formatting tool (tools/nbfmt_cli.py) across all 146 notebooks to standardize JSON formatting, remove trailing whitespace, and clean cell/root metadata.
• Documentation Updates: Updated CONTRIBUTING.md to provide clearer instructions on using the in-repo nbfmt and nblint tools.
• Bug Fixes: Fixed a malformed JSON syntax error in examples/gemini_google_adk_model_guardrails.ipynb.
• Repository Cleanup: Updated .gitignore to include Python cache artifacts (**/__pycache__/ and *.pyc).

Ignored Files

• Ignored by pattern: .github/workflows/** (2)
  • .github/workflows/new_examples_links_in_table_of_content.yml
  • .github/workflows/notebooks.yaml

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[gemini-code-assist]

Code Review

This pull request updates the repository's .gitignore to ignore Python cache artifacts and revises CONTRIBUTING.md to use the in-repo formatting and linting tools (nbfmt_cli.py and nblint_cli.py) instead of the deprecated tensorflow_docs tools. Additionally, numerous example notebooks are updated to use the new google-genai SDK (from google import genai) and to install the correct package version (google-genai>=2.9.0). Since the only review comment was on a file not modified in this pull request, it has been removed, and I have no further feedback to provide.