examples: add feature task example

Author: OgeonX-Ai

docs/examples/feature-task.md

@@ -0,0 +1,31 @@
+# Example: Feature Task
+
+## Goal
+
+Add a small user-visible capability to a repository using AI-OS.
+
+## Loop
+
+Feature development loop.
+
+## Steps
+
+1. Define user value.
+2. Define acceptance criteria.
+3. Inspect existing patterns.
+4. Plan small increments.
+5. Implement one increment.
+6. Run relevant checks.
+7. Update docs.
+8. Report evidence.
+
+## Evidence format
+
+```text
+Goal:
+Acceptance criteria:
+Files changed:
+Checks run:
+Result:
+Remaining risk:
+```