feat: per-project LLM models, ACP session pool, smart pagination tests

- ACP session pool with per-model subprocesses and 8h idle eviction
- Per-project LLM config: local override → mcpd recommendation → global default
- Model override support in ResponsePaginator
- /llm/models endpoint + available models in mcpctl status
- Remove --llm-provider/--llm-model from create project (use edit/apply)
- 8 new smart pagination integration tests (e2e flow)
- 260 mcplocal tests, 330 CLI tests passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/mcplocal/tests/project-mcp-endpoint.test.ts

@@ -6,8 +6,18 @@ import { registerProjectMcpEndpoint } from '../src/http/project-mcp-endpoint.js'
 // Mock discovery module — we don't want real HTTP calls
 vi.mock('../src/discovery.js', () => ({
   refreshProjectUpstreams: vi.fn(async () => ['mock-server']),
+  fetchProjectLlmConfig: vi.fn(async () => ({})),
 }));
 
+// Mock config module — don't read real config files
+vi.mock('../src/http/config.js', async () => {
+  const actual = await vi.importActual<typeof import('../src/http/config.js')>('../src/http/config.js');
+  return {
+    ...actual,
+    loadProjectLlmOverride: vi.fn(() => undefined),
+  };
+});
+
 import { refreshProjectUpstreams } from '../src/discovery.js';
 
 function mockMcpdClient() {