fix(enricher): use the right field names of EntityMention

[ceberam]

Summary

This PR fixes a bug in _make_entity_mention() where incorrect parameter names were used when creating EntityMention objects, and adds comprehensive regression tests to prevent similar issues.

Changes

Bug Fix

File: docling_agent/agent/enricher.py

• Fixed EntityMention constructor call to use correct parameter names:
  • original → orig
  • span → charspan

Regression Test

File: tests/test_enricher.py

• Added test_make_entity_mention() function covering 5 key scenarios:
  1. Basic entity mention creation
  2. Entity with original text and label
  3. Case-insensitive matching
  4. Entity not found in source
  5. Original text precedence in search

[mergify]

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[github-actions]

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