[francois-drielsma]

Description

Prefer (file_index, file_entry_index) for report event counts, then loader index (with file index when available), then complete run/subrun/event identifiers. Preserve CSV-path namespacing so independent job shards remain distinct. A file identifier alone no longer counts as an event identity.

Motivation and Context

Repeated simulation event IDs collapsed 14,240 entries into 40 reported events. This fixes event-count metadata while preserving reconstruction metric accumulation.

Type of Change

• Bug fix

How Has This Been Tested?

• Regression tests cover identifier priority and fallbacks, repeated event IDs, multiple files and CSV shards, duplicate object rows across chunks, and report-level confusion counts.
• Reporting and CLI tests: 73 passed; one unrelated permission test failed because the local filesystem strips the directory setgid bit (independently reproduced with chmod).
• Regenerated all six report sections from the existing production CSVs: all event-count fields show 14,240. Confusion matrices and histogram counts match exactly; floating-point statistics differ by at most 2.2e-14. No training or inference rerun.
• All commit hooks passed, including Black, isort and flake8.

Test configuration: macOS, Python 3.13.

Checklist

• Code follows project style and has been self-reviewed
• Identity-selection documentation updated
• Regression tests added
• CI passes (all 17 GitHub Actions jobs)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (31e2212) to head (469eb71).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #185   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          440       440           
  Lines        39331     39336    +5     
=========================================
+ Hits         39331     39336    +5     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/spine/vis/metric/report/base.py	100.00% <100.00%> (ø)

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