The file's body cites APM's Python source directly (apm_cli/models/validation.py,
apm_cli/primitives/models.py) to support its "no dedicated Agent validation"
claim, but source_keys only listed context7-microsoft-apm — the apm-github-repo
source_key was missing, and sources.md's apm-github-repo entry didn't list this
file under Contributing files either. The three sibling schema files from the
same commit (prompt/instructions/hooks) all cited both sources correctly.
Found via post-implementation review of issue #89.