Document project Git workflow

AGENTS.md

@@ -7,6 +7,16 @@
 - Portainer: `http://docker-test.cin.su:9000/`, user `admin`
 - Do not store the password in repositories or project files; use an SSH key for persistent access.
 
+## Project Git workflow
+
+- The canonical remote for this project is `https://git.cin.su/m/llm.git`
+  (`origin`), with `main` as the shared branch.
+- Use HTTPS authentication through Git Credential Manager; never put a
+  password or token into a repository file, remote URL, script, or commit.
+- After a coherent change has been verified, create a focused commit and push
+  it to `origin/main`. Do not commit unfinished work, unrelated user changes,
+  generated large artifacts, or secrets.
+
 ## GPU Docker Host
 
 - This project works with local LLM models and uses GPU resources.