docs: add AGENTS.md with PR-based development workflow

.gitignore

@@ -19,6 +19,7 @@
 
 !.env.example
 !LICENSE
+!AGENTS.md
 
 !assets/**/*
 

AGENTS.md

@@ -0,0 +1,10 @@
+# Agent Instructions
+
+## Development Workflow
+
+Never push directly to `main`. The correct process is:
+
+1. Create a feature branch from `main`.
+2. Make commits on the feature branch.
+3. Push the branch and open a pull request.
+4. Wait for the user to review and merge.