diff --git a/auditor/fixtures/hybrid_38_40_45.ts b/auditor/fixtures/hybrid_38_40_45.ts
index f8472b9..7b327f9 100644
--- a/auditor/fixtures/hybrid_38_40_45.ts
+++ b/auditor/fixtures/hybrid_38_40_45.ts
@@ -28,6 +28,13 @@ const BRIDGE = process.env.CONTEXT7_BRIDGE_URL ?? "http://localhost:3900";
 const FIXTURE_ID = "auditor:hybrid_38_40_45:v1";
 const TEST_WORKER_NAME = "__auditor_test_worker__";
 const STALE_HASH = "stale-hash-for-drift-proof";
+// Unique-per-run identifiers so each fixture invocation hits the ADD
+// path in upsert_entry (not UPDATE/NOOP on a leftover from a prior
+// run). Catches state pollution + avoids interaction with task #12
+// (UPDATE branch silently drops doc_refs).
+const RUN_NONCE = Date.now().toString(36);
+const TEST_WORKER_NAME_VERSIONED = `__auditor_test_worker_${RUN_NONCE}__`;
+const TEST_OPERATION_VERSIONED = `TEST: fill: __auditor_${RUN_NONCE}__ x1 in TestCity, TC`;
 
 export interface LayerResult {
   layer: string;
@@ -190,10 +197,10 @@ export async function runHybridFixture(): Promise<FixtureResult> {
       method: "POST",
       headers: { "content-type": "application/json" },
       body: JSON.stringify({
-        operation: `TEST: fill: __auditor__ x1 in TestCity, TC`,
+        operation: TEST_OPERATION_VERSIONED,
         approach: "auditor hybrid fixture run",
         context: "doc_refs integration test — retire after audit",
-        endorsed_names: [TEST_WORKER_NAME],
+        endorsed_names: [TEST_WORKER_NAME_VERSIONED],
         append: true,
         doc_refs: [
           {
@@ -215,8 +222,8 @@ export async function runHybridFixture(): Promise<FixtureResult> {
     const state_raw = await readFile("/home/profit/lakehouse/data/_playbook_memory/state.json", "utf8");
     const state = JSON.parse(state_raw);
     const entries = state.entries ?? [];
-    const ours = entries.find((e: any) => (e.endorsed_names ?? []).includes(TEST_WORKER_NAME));
-    if (!ours) throw new Error(`seeded entry not found in state.json (worker ${TEST_WORKER_NAME} not present)`);
+    const ours = entries.find((e: any) => (e.endorsed_names ?? []).includes(TEST_WORKER_NAME_VERSIONED));
+    if (!ours) throw new Error(`seeded entry not found in state.json (worker ${TEST_WORKER_NAME_VERSIONED} not present)`);
     const docRefs = ours.doc_refs ?? [];
     if (docRefs.length === 0) {
       throw new Error("entry saved but doc_refs field is empty — the field accepted by the API isn't being persisted");