agents: add repository agent instructions

Author: OgeonX-Ai

AGENTS.md

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+# AGENTS.md
+
+All AI coding agents working in this repository must follow AI Engineering Operating System.
+
+## Required loop
+
+```mermaid
+flowchart TD
+    A[Goal] --> B[Load context]
+    B --> C[Plan]
+    C --> D[Work]
+    D --> E[Verify]
+    E --> F{Done?}
+    F -- No --> D
+    F -- Yes --> G[Report]
+```
+
+## Agent rules
+
+- Load context before editing.
+- Plan before implementation.
+- Work in small reversible steps.
+- Verify with available tools.
+- Update docs and wiki sources when public docs change.
+- Report evidence honestly.