Model-provider discovery was filesystem-only (bundled dir, $HERMES_HOME,
legacy providers/*.py). The general PluginManager scans the
hermes_agent.plugins entry-point group but deliberately does NOT import
kind=model-provider manifests (providers/ owns their lifecycle), so a
pip-installed provider was recorded yet never called register_provider() —
it never appeared in the picker, contradicting the 'Distribute via pip' docs.
Add a _discover_entry_point_providers() step that scans the
hermes_agent.plugins group and imports each entry, supporting both a
module:func callable target and a bare self-registering module target.
- Runs BEFORE filesystem plugins (lowest precedence): last-writer-wins means
bundled/$HERMES_HOME profiles always override a pip provider of the same
name, so a third-party package cannot hijack a first-party provider id.
- Per-entry failures are isolated (logged + skipped), so one broken package
can't break discovery.
- Docs updated to describe the real mechanism; tests cover callable + module
targets, failure isolation, and first-party precedence.
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