* test: focus assertions on behavioral evidence
Prune redundant and wording-coupled checks while retaining diagnostic, parser, recovery, and cleanup coverage.
* refactor: remove test-only wrappers and duplicate checks
Exercise production operations through test fixtures, remove unused adapters, and keep managed-member uncertainty guidance under its existing owner.
* test: focus process validation on diagnostic facts
* refactor: remove test-only runtime helpers
Move semantic evidence fixture setup out of runtime and remove unused Windows settle recovery helpers while checking configured defaults independently.
* test: focus artifact diagnostics on format facts
* test: verify retained cleanup guidance delivery
Read bounded stable prefixes through the installation file owner, preserve unknown header diagnostics, and propagate cancellation or incomplete cleanup. Share extent and identity validation with full artifact reads.
Validated with 269 focused tests, check:fast, and docs:check. Controlled Darwin file faults reproduce the original lost owner; real Ghidra and native Windows/Linux verification remain unperformed.
Refs #4676
morluto