tegwick dfe56a4f9b docs(metrics): clarify C2 coverage — domain×chapter matrix, not domain×VSM ...

- coverage.py: rewrite module docstring to explain what the metric actually
  computes (domain × chapter cross-tabulation, not VSM system coverage),
  what it does not capture (entity connectivity → C3), and when the
  threshold is appropriate
- CoverageReport: add domain_densities, density_std, cross_cutting_ratio
  for distribution-level insight beyond the aggregate ratio
- check_coverage: compute per-domain density and cross-cutting ratio
- METRICS-METHODOLOGY.md: correct C2 section to match implementation,
  document the distribution-based interpretation, add implementation status
  table distinguishing what is wired vs planned

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-02-20 00:08:46 +01:00

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