Fix sitemap generation and validation

[sidey79]

• Updated tools/generate_sitemap.py to fix URL generation and validation
• Enhanced test coverage in tests/tools/test_generate_sitemap.py
• Added sitemap_validation_report.md with validation results
• Added sitemap_analysis_report.md with analysis of existing sitemap
• Generated updated sitemap.xml for documentation

[codecov]

Codecov Report

❌ Patch coverage is 93.93939% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.02%. Comparing base (53030a8) to head (8f8c209).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/generate_sitemap.py	60.00%	5 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   78.69%   79.02%   +0.32%     
==========================================
  Files          53       55       +2     
  Lines        4595     5177     +582     
  Branches      591      628      +37     
==========================================
+ Hits         3616     4091     +475     
- Misses        781      863      +82     
- Partials      198      223      +25     

Flag	Coverage Δ
unittests	79.02% <93.93%> (+0.32%)	⬆️

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