wiki: add verifiers page

Author: OgeonX-Ai

wiki/Verifiers.md

@@ -0,0 +1,21 @@
+# Verifiers
+
+Canonical verifier docs are in docs/verifiers.
+
+## Gate flow
+
+```mermaid
+flowchart TD
+    Change[Change] --> Build[Build]
+    Build --> Test[Test]
+    Test --> Docs[Docs]
+    Docs --> Risk[Risk review]
+    Risk --> Pass{Pass?}
+    Pass -- No --> Loop[Loop back]
+    Pass -- Yes --> Done[Done]
+```
+
+## Pages
+
+- docs/verifiers/README.md
+- docs/methodology/definition-of-done.md