feat: add click parsing with hello-world flag

[ezyang]

Stack from ghstack (oldest at bottom):

• -> feat: add click parsing with hello-world flag #252
• back to claude for debugging #250
• feat: replace playground with stdin loop in agno.py #249
• feat: Gemini Agno #248
• feat: Implement Git commit hash tracking #247
• feat: use git commit hash as chat ID #246
• feat: use git commit hash instead of static chat id #245

Add click parsing to codemcp/agno.py, and add a --hello-world flag which triggers the short circuited commented out agent.print_response logic.

89c5bd7  (Base revision)
ab5a1f3  Add click import
39fa084  Add hello_world parameter to main function
21be165  Add click CLI with hello-world flag
HEAD     Auto-commit format changes

codemcp-id: 263-feat-add-click-parsing-with-hello-world-flag