Adds VitalsConfig.thresholds_yaml_path / is_yaml_loaded /
assert_profiles_loaded / list_profiles / profiles / profile_diff so
external verifiers (notably the bench harness) can detect packaging
regressions and inspect framework profile divergence without poking
at dataclasses.fields() internals. ProfileFieldDiff and
UnknownProfileError re-exported from the agent_vitals top-level.
profile_diff compares against pure VitalsConfig() defaults so the
result is reproducible across env-var configurations. Detector
logic bit-identical to v1.13.1.

Tightens [tool.setuptools.package-data] with a *.yaml glob as
defense in depth alongside the explicit thresholds.yaml entry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>