Replace .ToArray() with collection spread, simplify single-statement
await using blocks, use Lock for Postgres schema gates, and document
IDE0063/IDE0305/IDE0330/CA1859 conventions in csharp-style.md.
Startup loader mirrors validate_content.py E7M4 gates (roster, freeze,
cross-ref, band caps); IContractTemplateRegistry resolves templates by id.
Bruno health smoke confirms host boot after catalog validation.
VinPropane