- scripts/validate_plugin_catalog.py: standalone stdlib+pyyaml structural
validator for plugin-catalog entries and removed.yaml (no hermes install
needed; runtime twin of hermes_cli/plugin_catalog.py). --json support,
unknown top-level keys warn instead of failing for forward compat.
- .github/actions/plugin-validate: composite action plugin authors drop
into their own repo's CI — installs hermes-agent from a chosen ref and
runs 'hermes plugins validate <path>'.
- .github/workflows/plugin-catalog-ci.yml: admission gate on PRs touching
plugin-catalog/** — structural job plus pinned-source job that clones
each changed entry's repo, hard-fails on unreachable pinned sha
(supply-chain gate), and validates the plugin at that exact commit.
