feat(graph): add diagnosis routing skeleton

src/main/java/com/superbiz/agent/graph/diagnosis/DiagnosisGraphStatus.java

@@ -0,0 +1,52 @@
+package com.superbiz.agent.graph.diagnosis;
+
+public final class DiagnosisGraphStatus {
+
+    private DiagnosisGraphStatus() {
+    }
+
+    public enum PlannerStatus {
+        COMPLETED,
+        INVALID_OUTPUT,
+        RETRYABLE_FAILED,
+        NON_RETRYABLE_FAILED
+    }
+
+    public enum ExecutorStatus {
+        COMPLETED,
+        INVALID_OUTPUT,
+        TOOL_BLOCKED,
+        FAILED
+    }
+
+    public enum GatekeeperStatus {
+        PASS,
+        LOW_CONFID,
+        REJECT
+    }
+
+    public enum VerifierStatus {
+        COMPLETED,
+        INVALID_OUTPUT,
+        RETRYABLE_FAILED,
+        NON_RETRYABLE_FAILED
+    }
+
+    public enum ComposerStatus {
+        COMPLETED,
+        INVALID_OUTPUT,
+        RETRYABLE_FAILED,
+        NON_RETRYABLE_FAILED
+    }
+
+    public enum Verdict {
+        PASS,
+        LOW_CONFID,
+        REJECT
+    }
+
+    public enum PlannerMode {
+        NORMAL,
+        EVIDENCE_GAP_ONLY
+    }
+}