feat(FN-2263): merge fusion/fn-2263 (auto-resolved)

- docs(FN-2263): update README with scaffolded scope and deferral documentation
- test(FN-2263): verify hermes runtime plugin build and tests
- feat(FN-2263): implement plugin entrypoint with runtime registration shell
- feat(FN-2263): scaffold Hermes runtime plugin package
- test(FN-2256): add mocks for createResolvedAgentSession in tests
- docs(FN-2256): update architecture docs and add changeset
- fix(FN-2256): fix lint errors and TypeScript issues
- feat(FN-2256): add runtime selection regression tests — Step 4
- feat(FN-2256): route engine session creation through runtime resolver — Step 3
- feat(FN-2256): extend PluginRunner runtime lookup surface — Step 2
- feat(FN-2256): add runtime abstraction and resolver — Step 1

plugins/fusion-plugin-hermes-runtime/manifest.json

@@ -0,0 +1,14 @@
+{
+  "id": "fusion-plugin-hermes-runtime",
+  "name": "Hermes Runtime Plugin",
+  "version": "0.1.0",
+  "description": "Hermes AI runtime plugin for Fusion - provides AI agent execution runtime capabilities",
+  "author": "Fusion Team",
+  "homepage": "https://github.com/gsxdsm/fusion",
+  "runtime": {
+    "runtimeId": "hermes-runtime",
+    "name": "Hermes AI Runtime",
+    "description": "AI agent execution runtime for Fusion tasks",
+    "version": "0.1.0"
+  }
+}