agents: add Copilot instructions

Author: OgeonX-Ai

.github/copilot-instructions.md

@@ -0,0 +1,21 @@
+# Copilot Instructions
+
+Follow AI Engineering Operating System for all repository work.
+
+## Working mode
+
+1. Read `README.md` and `AGENTS.md`.
+2. Select the correct loop from `docs/loops/`.
+3. Create a short plan before changing files.
+4. Make small changes.
+5. Run or describe verification.
+6. Update documentation when behavior or structure changes.
+
+## Preferred final response
+
+- Goal
+- Plan
+- Changes
+- Verification
+- Risks
+- Remaining work