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/http/config.test.ts

@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, afterEach } from 'vitest';
-import { loadLlmConfig } from '../../src/http/config.js';
+import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
+import { loadLlmConfig, resetConfigCache } from '../../src/http/config.js';
 import { existsSync, readFileSync } from 'node:fs';
 
 vi.mock('node:fs', async () => {
@@ -11,6 +11,10 @@ vi.mock('node:fs', async () => {
   };
 });
 
+beforeEach(() => {
+  resetConfigCache();
+});
+
 afterEach(() => {
   vi.restoreAllMocks();
 });