feat(project): Project.llmProvider semantically names an Llm resource

Why: Phases 0-3 built the server-managed Llm registry; this phase pivots the
existing Project.llmProvider column from "local provider hint" to "named Llm
reference" so operators can pick a centralised Llm per project. No schema
change — the column stays a free-form string for backward compat.

- `mcpctl create project --llm <name>` (+ `--llm-model <override>`) sets
  llmProvider/llmModel to a centralised Llm reference, or 'none' to disable.
- `mcpctl describe project` fetches the Llm catalogue alongside prompts and
  flags values that don't resolve with a visible warning. 'none' is treated
  as an explicit disable, not an orphan.
- `apply -f` doc comments updated; --llm-provider still accepted but now
  documented as naming an Llm resource.
- New `resolveProjectLlmReference(mcpdClient, name)` helper in mcplocal's
  discovery: returns `registered`/`disabled`/`unregistered`/`unreachable`.
  The HTTP-mode proxy-model pipeline will consume this when it pivots to
  mcpd's /api/v1/llms/:name/infer proxy.
- project-mcp-endpoint.ts cache-namespace path gets a comment explaining
  the new resolution order — behavior unchanged, just clarified.

Tests: 6 resolver unit tests + 3 new describe-warning cases. Full suite
1853/1853 (+9 from Phase 3's 1844). TypeScript clean; completions
regenerated for the new create-project flags.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/cli/tests/commands/describe.test.ts

@@ -108,6 +108,77 @@ describe('describe command', () => {
     expect(text).not.toContain('Gated:');
   });
 
+  it('shows project Llm reference without warning when the name matches a registered Llm', async () => {
+    const deps = makeDeps({
+      id: 'proj-1',
+      name: 'with-llm',
+      description: '',
+      ownerId: 'user-1',
+      proxyModel: 'default',
+      llmProvider: 'claude',
+      llmModel: 'claude-3-opus',
+      createdAt: '2025-01-01',
+    });
+    // /api/v1/llms returns a claude entry → no warning
+    deps.client = {
+      get: vi.fn(async (path: string) => {
+        if (path === '/api/v1/llms') return [{ name: 'claude' }];
+        return [];
+      }),
+    } as unknown as typeof deps.client;
+    const cmd = createDescribeCommand(deps);
+    await cmd.parseAsync(['node', 'test', 'project', 'proj-1']);
+    const text = deps.output.join('\n');
+    expect(text).toContain('LLM:');
+    expect(text).toContain('claude');
+    expect(text).not.toContain('warning:');
+  });
+
+  it('warns on describe project when llmProvider does not resolve to any registered Llm', async () => {
+    const deps = makeDeps({
+      id: 'proj-1',
+      name: 'orphan',
+      description: '',
+      ownerId: 'user-1',
+      proxyModel: 'default',
+      llmProvider: 'claude-ghost',
+      createdAt: '2025-01-01',
+    });
+    deps.client = {
+      get: vi.fn(async (path: string) => {
+        if (path === '/api/v1/llms') return [{ name: 'claude' }, { name: 'gpt-4o' }];
+        return [];
+      }),
+    } as unknown as typeof deps.client;
+    const cmd = createDescribeCommand(deps);
+    await cmd.parseAsync(['node', 'test', 'project', 'proj-1']);
+    const text = deps.output.join('\n');
+    expect(text).toContain('claude-ghost');
+    expect(text).toContain('warning:');
+    expect(text).toContain('fall back to registry default');
+  });
+
+  it('does not warn when llmProvider is "none" (explicit disable)', async () => {
+    const deps = makeDeps({
+      id: 'proj-1',
+      name: 'no-llm',
+      description: '',
+      ownerId: 'user-1',
+      proxyModel: 'default',
+      llmProvider: 'none',
+      createdAt: '2025-01-01',
+    });
+    deps.client = {
+      get: vi.fn(async () => []),
+    } as unknown as typeof deps.client;
+    const cmd = createDescribeCommand(deps);
+    await cmd.parseAsync(['node', 'test', 'project', 'proj-1']);
+    const text = deps.output.join('\n');
+    expect(text).toContain('LLM:');
+    expect(text).toContain('none');
+    expect(text).not.toContain('warning:');
+  });
+
   it('shows project Plugin Config defaulting to "default" when proxyModel is empty', async () => {
     const deps = makeDeps({
       id: 'proj-1',