Audit NAIL-RAPM Compilation

For NAIL-RAPM v1.0, verify that additive context coordinates compile exactly into player-level adjustments while the remaining non-additive lineup coordinates stay in the context term:

uv run nba-audit-linear-hpm-x3-compilation

The audit checks every frozen 2023-24 through 2025-26 regular-season and playoff possession. It writes an identity summary and target-season compiled player adjustments under artifacts/models/analysis/linear_hpm_x3_compilation_audit/.