Agent: ignore off-mode bootstrap signatures for once dedupe

src/agents/bootstrap-budget.test.ts

@@ -125,6 +125,27 @@ describe("bootstrap prompt warnings", () => {
     expect(resolveBootstrapWarningSignaturesSeen(undefined)).toEqual([]);
   });
 
+  it("ignores single-signature fallback when warning mode is off", () => {
+    expect(
+      resolveBootstrapWarningSignaturesSeen({
+        bootstrapTruncation: {
+          warningMode: "off",
+          promptWarningSignature: "off-mode-signature",
+        },
+      }),
+    ).toEqual([]);
+
+    expect(
+      resolveBootstrapWarningSignaturesSeen({
+        bootstrapTruncation: {
+          warningMode: "off",
+          warningSignaturesSeen: ["prior-once-signature"],
+          promptWarningSignature: "off-mode-signature",
+        },
+      }),
+    ).toEqual(["prior-once-signature"]);
+  });
+
   it("dedupes warnings in once mode by signature", () => {
     const analysis = analyzeBootstrapBudget({
       files: [

src/agents/bootstrap-budget.ts

@@ -100,6 +100,7 @@ function appendSeenSignature(signatures: string[], signature: string): string[]
 
 export function resolveBootstrapWarningSignaturesSeen(report?: {
   bootstrapTruncation?: {
+    warningMode?: BootstrapPromptWarningMode;
     warningSignaturesSeen?: string[];
     promptWarningSignature?: string;
   };
@@ -109,6 +110,10 @@ export function resolveBootstrapWarningSignaturesSeen(report?: {
   if (seenFromReport.length > 0) {
     return seenFromReport;
   }
+  // In off mode, signature metadata should not seed once-mode dedupe state.
+  if (truncation?.warningMode === "off") {
+    return [];
+  }
   const single =
     typeof truncation?.promptWarningSignature === "string"
       ? truncation.promptWarningSignature.trim()