2026-08-23-evidence-coverage-core

Coverage evidence execution

• appsurface coverage run and appsurface coverage gate now share one private execution engine with the built-in evidence run coverage producer. Coverage policies therefore evaluate the same collection, merge, gate, patch-target, artifact, and watchdog behavior regardless of which supported workflow invokes it; the private support package is not a new consumer dependency or installation choice.
• When an evidence policy supplies --diff-file, planning captures a bounded immutable snapshot before execution starts. Replacing that file later in the run cannot change the patch coverage input that the resolved policy evaluates.