Add exact CTest test selection

[aspix2k]

Purpose

Map affected CMake targets and artifacts to exact named CTest tests instead of relying on a target-name regex alone.

Acceptance criteria

• Read stable test identities and target/artifact relationships from supported CMake File API and CTest metadata.
• Use anchored exact CTest selection and preserve the owning build directory.
• Generated tests, fixtures, resources, configure/build changes, regex ambiguity and incomplete metadata run the full affected target test scope.
• Selected, skipped, failed and cancelled runs cannot replace a complete baseline.
• Public fixtures cover duplicate prefixes, fixtures, generated tests, added/deleted targets and a smaller faster exact run.

Decision rule

If CMake metadata cannot prove the relation, keep the current target-level CTest execution.