v0.1.9.6 Validation Substrate And Selection Integrity

v0.1.9.6 ships the validation substrate and evidence-only selection-integrity diagnostics: canonical single-run returns, retained-return panels/projections, native PBO/CSCV after the spike, MinTRL, DSR/effective-trial clustering, and the Selection Integrity article. It also records the intraday-readiness audit and current-surface peer benchmark redo. Business-objective filtering, purging/embargo/CPCV, intraday runtime, public benchmark claims, and compiled spot-FIFO default changes remain deferred.