docs: align notebook provider selection and docker build troubleshooting

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Description

Align documentation with recently changed notebook provider-selection behavior and Docker build constraints so setup and troubleshooting match current source behavior.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• New lab or capstone project
• Documentation update
• Test improvement
• Breaking change (fix or feature that would cause existing functionality to not work)

Related Issues

Fixes #(issue number)

Changes Made

• Updated docs/guides/colab-guide.md with the verified provider auto-selection order used in current notebooks (ANTHROPIC_API_KEY → OPENAI_API_KEY → GOOGLE_API_KEY → local Ollama).
• Added explicit failure-mode guidance for No LLM provider configured... to docs/guides/troubleshooting-guide.md, including Colab secret setup and Ollama fallback checks.
• Updated docker/README.md with current build stability constraints from docker/Dockerfile (base digest pin, unicorn==2.0.1.post1 compatibility with angr, temporary ssdeep exclusion) plus rebuild/recovery steps.
• Expanded Docker failure troubleshooting in docs/guides/troubleshooting-guide.md with concrete recovery commands and pin-verification checks.

Testing

Describe how you tested your changes:

• Ran pytest tests/ successfully
• Tested in Docker with docker-compose run test
• Manually tested the feature/fix
• Added new tests for the changes

Manual validation performed:

• Verified notebook provider setup logic and error message against source in notebooks/lab15_llm_log_analysis.ipynb.
• Verified Docker stability statements against source in docker/Dockerfile.
• Verified diffs are documentation-only and scoped to existing docs files.
• Attempted python3 -m pytest tests/test_curriculum_integrity.py -v, but pytest is unavailable in this execution environment (No module named pytest).

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing tests pass locally with my changes
• No API keys or secrets are included in the changes

Learning Impact (for lab changes)

If this PR affects labs, describe:

• Skills learners will gain: N/A (documentation-only)
• Prerequisites updated: N/A
• Estimated time impact: N/A

Screenshots (if applicable)

Add screenshots to help explain your changes.

  

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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