feat: use git commit hash as 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. Previously you already implemented get_current_commit_hash.

08d4d1d  (Base revision)
bcba045  Import get_current_commit_hash function
4227903  Add helper function to append commit hash to result
808a590  Update ReadFile to append commit hash to result
aed09f5  Update WriteFile to append commit hash to result
e410109  Update EditFile to append commit hash to result
HEAD     Update LS to append commit hash to result

codemcp-id: 257-feat-use-git-commit-hash-as-chat-id