merge: AgentProject membership — the junction is now load-bearing

Merges feat/agent-project-membership (task 166/152). An agent can finally join
many projects: membership routes, per-membership role and optional brain
override, chat resolving context from the membership, and CLI attach-agent /
detach-agent / get memberships. The legacy Agent.projectId fallback is kept for
this release as the schema comment promises.

Conflict resolved in main.ts: that branch added its RBAC case to
mapUrlToPermission inline, while this branch had extracted the function to
middleware/url-permission.ts so it could be tested. Kept the extraction and
ported the case into it — joining a team is `edit:agents:<name>`, not
`create:agents`, which is the authority to mint a whole agent.

Also fixes something the extraction makes possible. security.test.ts contained a
hand-copied reproduction of mapUrlToPermission, because main.ts self-invokes
main() and nothing in it was importable. A security test asserting against a
copy stops testing the system the moment the real one changes, and this copy had
already drifted. It now imports the real function; all 18 assertions still pass,
against the code that actually runs.

Local: build clean, workspace 2550 passed, lint unchanged at 794 errors.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4wNHWf7xSwnZCWpJcyv9p

.taskmaster/tasks/task_106.md

@@ -0,0 +1,97 @@
+# Task ID: 106
+
+**Title:** Implement Pause Queue for Model Studio
+
+**Status:** done
+
+**Dependencies:** 105 ✓
+
+**Priority:** medium
+
+**Description:** Add a pause queue in mcplocal that holds outgoing responses when model studio pause mode is active.
+
+**Details:**
+
+Create `src/mcplocal/src/proxymodel/pause-queue.ts`:
+
+```typescript
+interface PausedResponse {
+  id: string;
+  sessionId: string;
+  contentType: 'prompt' | 'toolResult';
+  sourceName: string;
+  original: string;
+  transformed: string;
+  resolve: (content: string) => void;
+  timestamp: number;
+}
+
+class PauseQueue {
+  private paused = false;
+  private queue: PausedResponse[] = [];
+  private listeners = new Set<(items: PausedResponse[]) => void>();
+  
+  setPaused(paused: boolean): void {
+    this.paused = paused;
+    if (!paused) {
+      // Release all paused items with their transformed content
+      for (const item of this.queue) {
+        item.resolve(item.transformed);
+      }
+      this.queue = [];
+    }
+    this.notifyListeners();
+  }
+  
+  isPaused(): boolean {
+    return this.paused;
+  }
+  
+  async enqueue(item: Omit<PausedResponse, 'resolve' | 'id' | 'timestamp'>): Promise<string> {
+    if (!this.paused) return item.transformed;
+    
+    return new Promise(resolve => {
+      this.queue.push({
+        ...item,
+        id: crypto.randomUUID(),
+        timestamp: Date.now(),
+        resolve,
+      });
+      this.notifyListeners();
+    });
+  }
+  
+  editAndRelease(id: string, editedContent: string): void {
+    const idx = this.queue.findIndex(q => q.id === id);
+    if (idx >= 0) {
+      const item = this.queue.splice(idx, 1)[0];
+      item.resolve(editedContent);
+      this.notifyListeners();
+    }
+  }
+  
+  releaseOne(id: string): void {
+    const idx = this.queue.findIndex(q => q.id === id);
+    if (idx >= 0) {
+      const item = this.queue.splice(idx, 1)[0];
+      item.resolve(item.transformed);
+      this.notifyListeners();
+    }
+  }
+  
+  dropOne(id: string): void {
+    const idx = this.queue.findIndex(q => q.id === id);
+    if (idx >= 0) {
+      const item = this.queue.splice(idx, 1)[0];
+      item.resolve(''); // Empty response
+      this.notifyListeners();
+    }
+  }
+}
+
+export const pauseQueue = new PauseQueue();
+```
+
+**Test Strategy:**
+
+Unit tests: enqueue returns immediately when not paused, enqueue blocks when paused, releaseOne/editAndRelease/dropOne work correctly, setPaused(false) releases all.