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_062.md

@@ -0,0 +1,51 @@
+# Task ID: 62
+
+**Title:** Update CLI edit project command for gated field
+
+**Status:** done
+
+**Dependencies:** 39 ✓
+
+**Priority:** medium
+
+**Description:** Extend mcpctl edit project to allow editing the gated boolean field.
+
+**Details:**
+
+1. Update `/src/cli/src/commands/edit.ts` for project:
+   ```typescript
+   async function editProject(name: string) {
+     const project = await api.get(`/api/v1/projects/${name}`);
+     
+     // Add gated to editable fields
+     const yaml = `
+   name: ${project.name}
+   description: ${project.description}
+   gated: ${project.gated}
+   llmProvider: ${project.llmProvider || ''}
+   ...`;
+     
+     const edited = await openEditor(yaml);
+     const parsed = YAML.parse(edited);
+     
+     // Validate gated is boolean
+     if (typeof parsed.gated !== 'boolean') {
+       console.error('gated must be true or false');
+       process.exit(1);
+     }
+     
+     await api.put(`/api/v1/projects/${name}`, parsed);
+   }
+   ```
+
+2. Update project validation schema to accept gated
+
+3. Handle conversion from string 'true'/'false' to boolean
+
+**Test Strategy:**
+
+- Unit test: Gated field appears in editor YAML
+- Unit test: Gated field saved on edit
+- Unit test: Boolean validation (true/false only)
+- Unit test: String 'true'/'false' converted to boolean
+- Integration test: End-to-end edit project gated