fix(tests): fix veto bug preventing disputed state, add manager notification and dispute-resolution routing

backend/app/schemas/test.py

@@ -125,6 +125,16 @@ class TestBlueValidate(BaseModel):
     blue_validation_notes: str | None = None
 
 
+# ── Dispute resolution ───────────────────────────────────────────────
+
+
+class TestResolveDispute(BaseModel):
+    """Payload sent by the approving lead flipping their vote to reject."""
+
+    target_team: str  # "red" | "blue" — which team must redo the work
+    notes: str | None = None
+
+
 # ── Red Lead review gate (pre-Blue-Team) ────────────────────────────