docs: add wiki home

Author: OgeonX-Ai

wiki/Home.md

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+# AI Engineering Operating System Wiki
+
+Welcome to the AI-OS wiki.
+
+## Main pages
+
+- [Master Operating Manual](../docs/ai-os/master-operating-manual.md)
+- [Mermaid Diagram Catalog](../docs/diagrams/README.md)
+- [Loop Catalog](../docs/loops/README.md)
+- [Prompt Templates](../prompts/README.md)
+
+## What this is
+
+AI-OS is a repeatable operating framework for AI coding agents.
+
+The core idea:
+
+```text
+Prompt once.
+Verify everything.
+Loop until the goal is achieved.
+Escalate when risk requires human approval.
+```
+
+## System overview
+
+```mermaid
+flowchart TD
+    Goal[Goal] --> Agent[AI Coding Agent]
+    Agent --> Context[Repository Context]
+    Agent --> Loop[Selected Engineering Loop]
+    Loop --> Verify[Verification Gates]
+    Verify --> Done{Done?}
+    Done -- No --> Loop
+    Done -- Yes --> Report[Final Report]
+```