Complete NBA Analytics I1-I4 reproducibility and BI model

[HeKoXCode]

Summary

• rebuild the ETL around explicit versioned contracts, immutable runs, quarantines, manifests and stable exit codes
• align canonical SQL Server tables/views with the 15-object Power BI model without deleting historical facts
• restructure the six-page PBIT, add methodology/limitations and compile a verified artifact
• add deterministic tests, 89.92% core coverage, real-run evidence and SQL Server 2022 CI integration

Verified locally

• 11 tests passed; 89.92% core coverage
• six real CSVs: 161,111 input rows, 161,009 canonical output rows, 155 quarantined duplicates, zero cross-table orphans
• PBIT: 6,374,566 bytes; SHA-256 18B49F8F2EE420D470358F08A08504C82EAB2CD34040ADD6A5D96756058478F5
• legacy S1-S4 validator: 78 checks passed
• I1-I4 validator and generated-artifact checks passed

Operational boundary

The PBIT is compiled and structurally validated. Replacement screenshots remain intentionally unpublished until a Windows Power BI Desktop refresh succeeds against a loaded local SQL instance; compilation is not represented as refresh evidence.