D12 — One policy source, distinct verification paths

Caption: The same policy implementation is compiled for controlled host checks and the synthetic firmware target. The optional physical path requires a separate acquisition integration and actual bench evidence; it is not performed by the core project.

Alt text: Shared Sensor Monitor policy branches into host execution with synthetic samples and injected time, and firmware compilation with the synthetic adapter. Host assertions/replay establish software behavior for controlled cases; the cross-build establishes a target build result. A dashed future physical adapter leads to separate bench evidence. Core software checks do not establish wiring, sensor accuracy, or physical timing.

Editable sources: Mermaid and SVG. Original course diagram, with no third-party imagery. Mapped to Chapter 15 and M07-L01/L03. The diagram is conceptual and supplies no observed runtime or hardware result. Full-size rendering and any PNG fallback belong to final figure acceptance.