feat(FN-1216): rename extension tools to fn_* across CLI and docs

- Rename all pi extension tool registrations from kb_* to fn_* across task, mission, and agent tool families
- Update extension and skill-sync tests plus Fusion skill docs/workflows to assert and document the new fn_* tool names
- Align product-identity strings across core, dashboard, and CLI references, including GitHub import examples, User-Agent headers, and terminal TERM_PROGRAM
- Add a @gsxdsm/fusion minor changeset describing the extension tool-prefix rename

packages/dashboard/app/components/SettingsModal.tsx

@@ -14,7 +14,7 @@ import { applyPresetToSelection, generateUniquePresetId } from "../utils/modelPr
  *
  * Each section groups related settings fields under a sidebar nav item.
  * Sections have a `scope` to indicate where their settings are stored:
- *   - "global": User-level settings stored in ~/.pi/kb/settings.json (shared across projects)
+ *   - "global": User-level settings stored in ~/.pi/fusion/settings.json (shared across projects)
  *   - "project": Project-specific settings stored in .fusion/config.json
  *   - undefined: Section operates independently of settings storage (e.g. authentication)
  *
@@ -1355,7 +1355,7 @@ export function SettingsModal({
                 disabled={form.recycleWorktrees}
               >
                 <option value="random">Random names (e.g., swift-falcon)</option>
-                <option value="task-id">Task ID (e.g., kb-042)</option>
+                <option value="task-id">Task ID (e.g., fn-042)</option>
                 <option value="task-title">Task title (e.g., fix-login-bug)</option>
               </select>
               <small>

packages/dashboard/src/github-webhooks.ts

@@ -388,7 +388,7 @@ export async function fetchInstallationToken(
           Accept: "application/vnd.github+json",
           "X-GitHub-Api-Version": "2022-11-28",
           Authorization: `Bearer ${jwt}`,
-          "User-Agent": "kb-dashboard/1.0",
+          "User-Agent": "fn/1.0",
         },
       },
     );
@@ -424,7 +424,7 @@ export async function fetchCanonicalPrInfo(
           Accept: "application/vnd.github+json",
           "X-GitHub-Api-Version": "2022-11-28",
           Authorization: `Bearer ${installationToken}`,
-          "User-Agent": "kb-dashboard/1.0",
+          "User-Agent": "fn/1.0",
         },
       },
     );
@@ -478,7 +478,7 @@ export async function fetchCanonicalIssueInfo(
           Accept: "application/vnd.github+json",
           "X-GitHub-Api-Version": "2022-11-28",
           Authorization: `Bearer ${installationToken}`,
-          "User-Agent": "kb-dashboard/1.0",
+          "User-Agent": "fn/1.0",
         },
       },
     );

packages/dashboard/src/github.ts

@@ -1416,7 +1416,7 @@ export class GitHubClient {
     const headers: Record<string, string> = {
       Accept: "application/vnd.github+json",
       "X-GitHub-Api-Version": "2022-11-28",
-      "User-Agent": "kb-dashboard/1.0",
+      "User-Agent": "fn/1.0",
     };
 
     if (this.token) {
@@ -2006,7 +2006,7 @@ export class GitHubClient {
             Accept: "application/vnd.github+json",
             "X-GitHub-Api-Version": "2022-11-28",
             Authorization: `Bearer ${jwt}`,
-            "User-Agent": "kb-dashboard/1.0",
+            "User-Agent": "fn/1.0",
           },
         },
       );
@@ -2040,7 +2040,7 @@ export class GitHubClient {
             Accept: "application/vnd.github+json",
             "X-GitHub-Api-Version": "2022-11-28",
             Authorization: `Bearer ${installationToken}`,
-            "User-Agent": "kb-dashboard/1.0",
+            "User-Agent": "fn/1.0",
           },
         },
       );
@@ -2093,7 +2093,7 @@ export class GitHubClient {
             Accept: "application/vnd.github+json",
             "X-GitHub-Api-Version": "2022-11-28",
             Authorization: `Bearer ${installationToken}`,
-            "User-Agent": "kb-dashboard/1.0",
+            "User-Agent": "fn/1.0",
           },
         },
       );

packages/dashboard/src/routes.ts

@@ -1582,7 +1582,7 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
   /**
    * PUT /api/settings/global
    * Update global (user-level) settings in ~/.pi/fusion/settings.json.
-   * These settings persist across all kb projects for the current user.
+   * These settings persist across all fn projects for the current user.
    */
   router.put("/settings/global", async (req, res) => {
     try {
@@ -3770,7 +3770,7 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
 
   /**
    * POST /api/github/issues/import
-   * Import a specific GitHub issue as a kb task.
+   * Import a specific GitHub issue as a fn task.
    * Body: { owner: string, repo: string, issueNumber: number }
    * Returns: Created Task object
    */
@@ -3865,7 +3865,7 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
 
   /**
    * POST /api/github/issues/batch-import
-   * Import multiple GitHub issues as kb tasks with throttling.
+   * Import multiple GitHub issues as fn tasks with throttling.
    * Body: { owner: string, repo: string, issueNumbers: number[], delayMs?: number }
    * Returns: { results: BatchImportResult[] }
    */
@@ -4096,7 +4096,7 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
 
   /**
    * POST /api/github/pulls/import
-   * Import a specific GitHub pull request as a kb review task.
+   * Import a specific GitHub pull request as a fn review task.
    * Body: { owner: string, repo: string, prNumber: number }
    * Returns: Created Task object
    */
@@ -9140,7 +9140,7 @@ Output ONLY the prompt text (no markdown, no explanations).`;
 
   /**
    * POST /api/projects/detect
-   * Auto-detect kb projects in a directory.
+   * Auto-detect fn projects in a directory.
    * Body: { basePath?: string }
    * Returns: { projects: DetectedProject[] }
    */
@@ -9167,7 +9167,7 @@ Output ONLY the prompt text (no markdown, no explanations).`;
       
       const existingPaths = new Set(existingProjects.map((p: { path: string }) => p.path));
       
-      // Scan for .fusion/fusion.db or .fusion/fusion.db files (indicating kb projects)
+      // Scan for .fusion/fusion.db or .fusion/fusion.db files (indicating fn projects)
       const detected: Array<{ path: string; suggestedName: string; existing: boolean }> = [];
       
       try {

packages/dashboard/src/server.ts

@@ -150,7 +150,7 @@ export function createServer(store: TaskStore, options?: ServerOptions): ReturnT
   // Serve built React app
   // Resolution order:
   //   1. FUSION_CLIENT_DIR env override (explicit)
-  //   2. Next to process.execPath (bun-compiled binary: dist/kb + dist/client/)
+  //   2. Next to process.execPath (bun-compiled binary: dist/fn + dist/client/)
   //   3. __dirname/../dist/client  (running from src/ via tsx/ts-node)
   //   4. __dirname/../client        (running from dist/ after tsc)
   const execDir = dirname(process.execPath);

packages/dashboard/src/terminal-service.ts

@@ -454,7 +454,7 @@ export class TerminalService extends EventEmitter {
       ...cleanEnv,
       TERM: "xterm-256color",
       COLORTERM: "truecolor",
-      TERM_PROGRAM: "kb-terminal",
+      TERM_PROGRAM: "fn-terminal",
       LANG: process.env.LANG || "en_US.UTF-8",
       LC_ALL: process.env.LC_ALL || process.env.LANG || "en_US.UTF-8",
       ...options.env,