Improve coordinate table gating and export

[adelavega]

Summary

Improve ACE’s coordinate-table gating and expose a reusable extraction API for Autonima.

Changes

• Add public ace.ingest.extract_and_export(...) API using a temporary SQLite database.
• Separate coordinate-table gating from deterministic coordinate parsing:
  • retain candidate tables in tables.csv even when ACE extracts zero coordinates;
  • keep coordinates.csv limited to successfully parsed coordinates.
• Improve candidate detection for:
  • hierarchical x/y/z headers;
  • combined coordinate columns;
  • Unicode minus signs;
  • malformed rows;
  • captions and footnotes.
• Isolate innermost tables and deduplicate equivalent inline and linked tables.
• Improve handling for PMC, ScienceDirect, Springer, and Journal of Cognitive Neuroscience layouts.
• Recover legacy JCN tables exposed through JavaScript placeholders using DOI-linked browser retrieval.
• Correct exported table-footnote metadata.
• Expose ACE’s version for downstream cache invalidation.

Validation

• Full ACE test suite: 44 passed
• Added regression coverage for:
  • candidate tables with zero deterministic coordinates;
  • combined and Unicode coordinates;
  • nested and duplicate tables;
  • public extraction/export;
  • legacy JCN linked-table expansion.