templates: add agent instructions template

Author: OgeonX-Ai

templates/agent-instructions-template.md

@@ -0,0 +1,39 @@
+# Agent Instructions Template
+
+Use this file as `AGENTS.md` in a target repository.
+
+## Operating model
+
+Follow AI Engineering Operating System.
+
+```mermaid
+flowchart TD
+    A[Goal] --> B[Load context]
+    B --> C[Select loop]
+    C --> D[Plan]
+    D --> E[Work]
+    E --> F[Verify]
+    F --> G{Done?}
+    G -- No --> C
+    G -- Yes --> H[Report]
+```
+
+## Required behavior
+
+- Read repository context before editing.
+- Select the appropriate loop.
+- Plan before implementation.
+- Keep changes small and reversible.
+- Run available verifiers.
+- Update docs when behavior changes.
+- Report evidence honestly.
+
+## Repository-specific commands
+
+```text
+Build:
+Test:
+Lint:
+Security:
+Docs:
+```