refactor(rebirth): isolate vector and reroll gates

vector/vector-gate.js

@@ -0,0 +1,28 @@
+// ST-BME vector readiness boundary helpers.
+//
+// Pure planning helpers only. They decide whether vector preparation should
+// attempt identity repair, skip, block, or run sync; vector indexing/search
+// algorithms stay in vector-index.js.
+
+export function planVectorReadyCheck({
+  hasGraph = false,
+  metadataWriteAllowed = false,
+  mutationContextAllowed = false,
+  repairAttempted = false,
+  dirty = false,
+  configValid = false,
+} = {}) {
+  if (!hasGraph) return { action: "skip", reason: "missing-graph" };
+
+  if (!metadataWriteAllowed && !mutationContextAllowed) {
+    if (!repairAttempted) {
+      return { action: "repair-identity", reason: "missing-mutation-context" };
+    }
+    return { action: "block", reason: "missing-mutation-context" };
+  }
+
+  if (!dirty) return { action: "skip", reason: "vector-clean" };
+  if (!configValid) return { action: "skip", reason: "invalid-vector-config" };
+
+  return { action: "sync", reason: "vector-dirty" };
+}