Invalidate workflow Evidence written before upstream limitation propagation, including workflows that previously had no revision. Advance the PE Program PDB observation contract to prevent replaying legacy nullable-state projections while retaining historical Evidence.
Validation: 219 focused tests across 15 suites pass, with two Windows-only cases skipped on Linux. Three historical-profile regressions fail before the fix and pass afterward. Current workflow snapshots replay without extra provider startup or calls; standalone typecheck and changed-file lint pass.