feat: completions update, create promptrequest, LLM flag rename, ACP content fix

- Add prompts/promptrequests to shell completions (fish + bash)
- Add approve, setup, prompt, promptrequest commands to completions
- Add `create promptrequest` CLI command (POST /projects/:name/promptrequests)
- Rename --proxy-mode-llm-provider/model to --llm-provider/model
- Fix ACP client: handle single-object content format from real Gemini
- Add tests for single-object content and agent_thought_chunk filtering

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

src/cli/tests/completions.test.ts

@@ -15,7 +15,7 @@ describe('fish completions', () => {
   });
 
   it('does not offer resource types without __mcpctl_needs_resource_type guard', () => {
-    const resourceTypes = ['servers', 'instances', 'secrets', 'templates', 'projects', 'users', 'groups', 'rbac'];
+    const resourceTypes = ['servers', 'instances', 'secrets', 'templates', 'projects', 'users', 'groups', 'rbac', 'prompts', 'promptrequests'];
     const lines = fishFile.split('\n').filter((l) => l.startsWith('complete '));
 
     for (const line of lines) {