docs: add AI-OS anti-patterns

Author: OgeonX-Ai

docs/methodology/anti-patterns.md

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+# Anti-patterns
+
+AI-OS exists to reduce common AI coding failure modes.
+
+## Anti-pattern loop
+
+```mermaid
+flowchart TD
+    A[Observe behavior] --> B{Problem?}
+    B -- No --> C[Continue]
+    B -- Yes --> D[Name it]
+    D --> E[Add rule or verifier]
+    E --> F[Update docs]
+```
+
+## Common anti-patterns
+
+- Coding before understanding the goal.
+- Skipping repository context.
+- Making broad changes without a plan.
+- Treating self-review as proof.
+- Not updating docs after behavior changes.
+- Leaving wiki and docs inconsistent.
+- Creating automation without approval gates.
+- Optimizing without measurement.
+- Refactoring without baseline checks.