feat: normalize OCR tables

[atsyplenkov]

Adds optional OCR table normalization behind --normalize-tables.

Summary:

• writes raw table HTML artifacts under tables/
• replaces indexed tables with compact Markdown blocks
• skips code fences and inline code
• adds managed-output cleanup and logging stats for table processing

Verification:

• cargo test --features internal-testing

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 81.46487% with 124 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.97%. Comparing base (fd78353) to head (e224f0a).

Files with missing lines	Patch %	Lines
src/core/table_normalization.rs	83.50%	97 Missing ⚠️
src/core.rs	52.17%	22 Missing ⚠️
src/core/output.rs	72.22%	5 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   85.45%   83.97%   -1.48%     
==========================================
  Files           8        9       +1     
  Lines         990     1629     +639     
==========================================
+ Hits          846     1368     +522     
- Misses        144      261     +117     

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