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/commands/project.test.ts

@@ -30,8 +30,8 @@ describe('project with new fields', () => {
         'project', 'smart-home',
         '-d', 'Smart home project',
         '--proxy-mode', 'filtered',
-        '--proxy-mode-llm-provider', 'gemini-cli',
-        '--proxy-mode-llm-model', 'gemini-2.0-flash',
+        '--llm-provider', 'gemini-cli',
+        '--llm-model', 'gemini-2.0-flash',
         '--server', 'my-grafana',
         '--server', 'my-ha',
       ], { from: 'user' });