fix(plugins): re-export probe symbols + declare plugin deps in dashboard

- Hermes / OpenClaw plugin index.ts now re-export `probeHermesBinary` /
  `probeOpenClawBinary` and their status types so the dashboard's
  `runtime-provider-probes.ts` façade can import them via the public
  package entry instead of deep paths.
- Dashboard `package.json` adds `@fusion-plugin-examples/hermes-runtime`,
  `…/openclaw-runtime`, `…/paperclip-runtime` as workspace deps so
  pnpm symlinks them into `packages/dashboard/node_modules/`. Without
  these, the new probe imports failed with "Cannot find module" during
  `pnpm typecheck`.

This clears 6 of the 9 outstanding typecheck errors. The remaining 3 are
in the in-flight Hermes plugin rewrite (runtime-adapter still imports
from a deleted `./pi-module.js`; the new `index.ts` calls a factory
with the wrong arg type) and should be resolved by the same change set
that landed the rewrite.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/plugin-sdk/src/index.ts

@@ -57,11 +57,11 @@ export type {
   FusionPlugin,
   PluginState,
   PluginInstallation,
-} from "../../core/src/plugin-types.js";
+} from "@fusion/core";
 
-export { validatePluginManifest } from "../../core/src/plugin-types.js";
+export { validatePluginManifest } from "@fusion/core";
 
-import type { FusionPlugin } from "../../core/src/plugin-types.js";
+import type { FusionPlugin } from "@fusion/core";
 
 /**
  * Type-safe helper for defining a Fusion plugin.