- Add engine-guard-stub test modules for hermes, openclaw, and paperclip runtime plugins to fail fast on unmocked @fusion/engine imports
- Update each plugin Vitest config to alias @fusion/engine to the local guard stub during test runs
- Keep setup-engine-guard behavior while removing dependency on built engine dist artifacts for plugin-local tests
- Regenerate fusion-plugin-hermes-runtime build artifacts and manifest metadata for runtime packaging
- Refactor Hermes runtime source into dedicated pi-module, runtime-adapter, and shared type modules
- Expand Hermes and engine plugin-runner tests to validate cross-runtime compatibility behavior
- Update getting-started, settings reference, and Hermes README docs to reflect the current runtime integration guidance
