feat(FN-3195): document llama.cpp provider setup and onboarding

Docs(FN-3195): adds llama.cpp provider setup and onboarding documentation to the main and dashboard READMEs.

Fusion-Task-Id: FN-3195

packages/dashboard/src/server.ts

@@ -287,6 +287,8 @@ export interface ServerOptions {
    * settings PUT to fail.
    */
   onUseDroidCliToggled?: (prev: boolean, next: boolean) => void;
+  /** Called when the user toggles the `useLlamaCpp` global setting. */
+  onUseLlamaCppToggled?: (prev: boolean, next: boolean) => void;
   /**
    * Returns the host's last-observed resolution of the bundled `droid-cli`
    * extension wiring. Populated by serve/daemon/dashboard startup checks.
@@ -305,6 +307,17 @@ export interface ServerOptions {
         reason?: string;
       }
     | null;
+  /** Returns the host's last-observed resolution of the bundled
+   * `@fusion/pi-llama-cpp` extension wiring. Populated by startup checks.
+   */
+  getLlamaCppExtensionStatus?: () =>
+    | {
+        status: "ok" | "not-installed" | "missing-entry" | "error";
+        path?: string;
+        packageVersion?: string;
+        reason?: string;
+      }
+    | null;
   /** Optional SkillsAdapter for skills discovery, execution toggling, and catalog fetching */
   skillsAdapter?: SkillsAdapter;
   /** Daemon mode configuration with bearer token authentication.