feat: use git commit hash instead of static chat id

[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

Instead of passing a single static chat id across all conversations, we're going to pass the current Git commit hash. Whenever a command returns, we will query and report what the new current commit hash is in the output. Update the system prompt to ensure that we maintain a current commit hash state and pass it / update it to all tool calls. Do NOT manually update every subtool, instead, there should be unified handling in the codemcp tool main body.

1df0498  (Base revision)
df80e3b  Add get_current_commit_hash to __all__ exports
HEAD     Add get_current_commit_hash function

codemcp-id: 256-feat-use-git-commit-hash-instead-of-static-chat-id