Add project agent instructions

AGENTS.md

@@ -0,0 +1,17 @@
+# Project Instructions
+
+## Git Workflow
+
+- After changing project files, run relevant validation or tests when available.
+- Check `git status` before committing.
+- Commit only the changes made for the current task.
+- Push successful commits to `origin/main`.
+- Skip commit or push only when the user explicitly asks not to.
+
+## Existing Validation
+
+- For content data changes, run:
+
+```bash
+python3 scripts/validate_content.py
+```