docs: add agent compatibility guide

Author: OgeonX-Ai

docs/agent-compatibility/README.md

@@ -0,0 +1,35 @@
+# Agent Compatibility
+
+AI-OS is model- and tool-agnostic.
+
+## Compatible agent types
+
+- ChatGPT web sessions
+- Claude Code style local agents
+- Codex style coding agents
+- Gemini CLI style coding agents
+- Copilot coding agent workflows
+- MCP-enabled local toolchains
+- editor-integrated coding agents
+
+## Compatibility rule
+
+The agent does not need special support for every AI-OS concept. It only needs to follow the loop:
+
+```mermaid
+flowchart TD
+    A[Load context] --> B[Plan]
+    B --> C[Work]
+    C --> D[Verify]
+    D --> E{Done?}
+    E -- No --> B
+    E -- Yes --> F[Report]
+```
+
+## Minimum support
+
+- read files
+- edit files
+- explain plan
+- run or request checks
+- report evidence