Audit Portable Context Attribution

Build exact player-level accounting for selected, realized 2025-26 units using the frozen 2024-25 Value-Conditioned Aging HPM context state:

uv run nba-build-portable-context-attribution-audit --through-season 2025-26

The audit uses exact Shapley values rather than equal teammate splits. Five composition contributions reconcile to each side's portable composition score. Ten matchup contributions reconcile to the opponent-specific residual. The published audit page defines the accounting origin and interpretation boundaries.