docs: add local runner concept

Author: OgeonX-Ai

docs/local-runner/README.md

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+# Local Runner
+
+The local runner is the future executable layer of AI-OS.
+
+## Runner loop
+
+```mermaid
+flowchart TD
+    A[Goal] --> B[Load context]
+    B --> C[Select loop]
+    C --> D[Work step]
+    D --> E[Check result]
+    E --> F{Pass?}
+    F -- No --> G[Feedback]
+    G --> D
+    F -- Yes --> H[Report]
+```
+
+## Minimum responsibilities
+
+- read repository context
+- select task loop
+- run verifier commands
+- capture evidence
+- pause at approval gates
+- update memory files
+
+## First version
+
+The first version can be a simple command-line wrapper.