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_030.md

@@ -0,0 +1,61 @@
+# Task ID: 30
+
+**Title:** Add Gemini CLI LLM provider
+
+**Status:** done
+
+**Dependencies:** 25 ✓
+
+**Priority:** medium
+
+**Description:** Implement a new LLM provider that uses the Gemini CLI binary for local, free LLM inference as the preferred provider for pre-processing.
+
+**Details:**
+
+1. Create `src/mcplocal/src/providers/gemini-cli.ts`:
+   ```typescript
+   import { spawn } from 'child_process';
+   
+   export class GeminiCliProvider implements LlmProvider {
+     readonly name = 'gemini-cli';
+     private binaryPath: string;
+     
+     constructor(config: GeminiCliConfig) {
+       this.binaryPath = config.binaryPath || 'gemini';
+     }
+     
+     async isAvailable(): Promise<boolean> {
+       // Check if gemini binary exists and is executable
+       try {
+         await this.runCommand(['--version']);
+         return true;
+       } catch {
+         return false;
+       }
+     }
+     
+     async complete(options: CompletionOptions): Promise<CompletionResult> {
+       const input = this.formatPrompt(options);
+       const output = await this.runCommand(['--prompt', input]);
+       return { content: output, model: 'gemini-cli' };
+     }
+     
+     private async runCommand(args: string[]): Promise<string> {
+       // Spawn gemini CLI process and capture output
+     }
+   }
+   ```
+2. Research actual Gemini CLI interface and adjust implementation
+3. Add to provider registry with high priority (prefer over API providers)
+4. Add configuration: `geminiCliBinaryPath`
+5. Handle timeout for slow inference
+6. Add fallback to next provider if Gemini CLI fails
+
+**Test Strategy:**
+
+1. Unit test: Provider correctly detects CLI availability
+2. Unit test: Prompt formatting is correct
+3. Unit test: Output parsing handles various formats
+4. Integration test: Full completion with actual Gemini CLI (if available)
+5. Test timeout handling for slow responses
+6. Test fallback when CLI is not installed