- Add end-to-end Hermes runtime test covering PluginStore registration through PluginLoader and PluginRunner resolution
- Verify createResolvedAgentSession uses the Hermes runtime and delegates createFnAgent, promptWithFallback, and describeModel calls
- Add regression test ensuring AgentRuntime-shaped Hermes adapters are reused without compatibility wrapping
- Cover fallback behavior to default pi runtime when Hermes plugin is not installed
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