diff --git a/packages/core/src/__tests__/store-parsing.test.ts b/packages/core/src/__tests__/store-parsing.test.ts
index ed2bcad1e8..9bcd1fd30d 100644
--- a/packages/core/src/__tests__/store-parsing.test.ts
+++ b/packages/core/src/__tests__/store-parsing.test.ts
@@ -419,6 +419,96 @@ describe("TaskStore", () => {
       const paths = await store.parseFileScopeFromPrompt(task.id);
       expect(paths).toEqual(["packages/dashboard/app/components/TaskDetailModal.tsx"]);
     });
+
+    it("deduplicates effective write scope while preserving broad mixed-case source globs", async () => {
+      const task = await store.createTask({ description: "Duplicate effective scope" });
+      const dir = join(rootDir, ".fusion", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: Duplicate effective scope
+
+## File Scope
+
+- \`packages/core/**\`
+- \`packages/core/**\`
+- \`Packages/MobileApp/**\`
+- \`Tests/AtlasNotesMobileUITests/**\`
+`,
+      );
+
+      const paths = await store.parseFileScopeFromPrompt(task.id);
+      expect(paths).toEqual([
+        "packages/core/**",
+        "Packages/MobileApp/**",
+        "Tests/AtlasNotesMobileUITests/**",
+      ]);
+    });
+
+    it("excludes poisoned FN-779/FN-756 context-only paths from effective write scope", async () => {
+      const task = await store.createTask({ description: "Poisoned Fusion prompt" });
+      const dir = join(rootDir, ".fusion", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: Poisoned Fusion prompt
+
+## File Scope
+
+Expected touched paths in \`/Users/plarson/src/Fusion-local-runtime\`:
+
+- \`packages/core/src/store.ts\`
+- \`packages/engine/src/scheduler.ts\`
+- \`packages/dashboard/**\`
+- \`packages/cli/**\`
+- \`packages/core/src/__tests__/store-parsing.test.ts\`
+
+Forbidden paths / non-goals:
+
+- Do not edit Atlas Notes Swift/mobile files: \`project.yml\`, \`AtlasNotes.xcodeproj/**\`, \`Tests/AtlasNotesMobileUITests/**\`, \`Packages/MobileApp/**\`, \`Sources/**\`.
+- Do not hand-edit \`.fusion/fusion.db\` or \`.fusion/tasks/*/task.json\`.
+- Generated locks such as \`Packages/*/Package.resolved\` are evidence only.
+- \`.changeset/*.md\` is required only if published behavior changes.
+- Operator routes/actions: \`/tasks/:id\`, \`fn_task_update\`, \`review\`, \`merge\`, \`retry\`, \`archive\`.
+`,
+      );
+
+      const paths = await store.parseFileScopeFromPrompt(task.id);
+      expect(paths).toEqual([
+        "packages/core/src/store.ts",
+        "packages/engine/src/scheduler.ts",
+        "packages/dashboard/**",
+        "packages/cli/**",
+        "packages/core/src/__tests__/store-parsing.test.ts",
+      ]);
+    });
+
+    it("keeps true Atlas mobile hot-file family writes when declared as implementation scope", async () => {
+      const task = await store.createTask({ description: "Atlas mobile scope" });
+      const dir = join(rootDir, ".fusion", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: Atlas mobile scope
+
+## File Scope
+
+Expected touched paths:
+
+- \`project.yml\`
+- \`AtlasNotes.xcodeproj/**\`
+- \`Tests/AtlasNotesMobileUITests/**\`
+- \`Packages/MobileApp/**\`
+- \`Sources/AtlasNotesMobileApp/**\`
+`,
+      );
+
+      const paths = await store.parseFileScopeFromPrompt(task.id);
+      expect(paths).toEqual([
+        "project.yml",
+        "AtlasNotes.xcodeproj/**",
+        "Tests/AtlasNotesMobileUITests/**",
+        "Packages/MobileApp/**",
+        "Sources/AtlasNotesMobileApp/**",
+      ]);
+    });
   });
 
   describe("FN-5216 File Scope sanitization on copy paths", () => {
diff --git a/packages/engine/src/__tests__/triage.test.ts b/packages/engine/src/__tests__/triage.test.ts
index 6e02f94282..c76e96a26b 100644
--- a/packages/engine/src/__tests__/triage.test.ts
+++ b/packages/engine/src/__tests__/triage.test.ts
@@ -1813,6 +1813,84 @@ describe("approved triage recovery", () => {
     );
   });
 
+  it("stamps source metadata from sanitized effective write scope during recovery", async () => {
+    await writeFile(
+      join(rootDir, ".fusion", "tasks", "FN-001", "PROMPT.md"),
+      `# Task: FN-001 - Fix poisoned scope
+
+**Size:** L
+
+## File Scope
+
+Expected touched paths:
+
+- \`packages/core/src/store.ts\`
+- \`packages/engine/src/scheduler.ts\`
+- \`packages/dashboard/**\`
+
+Forbidden paths / non-goals:
+
+- Do not edit Atlas files: \`AtlasNotes.xcodeproj/**\`, \`Tests/AtlasNotesMobileUITests/**\`, \`Packages/MobileApp/**\`.
+- Evidence only: \`.fusion/fusion.db\`, \`.fusion/tasks/*/task.json\`, \`Packages/*/Package.resolved\`.
+- Conditional only: \`.changeset/*.md\`.
+`,
+    );
+
+    const store = createMockStore({
+      getSettings: vi.fn().mockResolvedValue({
+        maxConcurrent: 2,
+        maxWorktrees: 4,
+        pollIntervalMs: 10000,
+        groupOverlappingFiles: false,
+        autoMerge: true,
+        requirePlanApproval: false,
+      } as Settings),
+      parseFileScopeFromPrompt: vi.fn().mockResolvedValue([]),
+    });
+
+    const processor = new TriageProcessor(store, rootDir);
+    const recovered = await processor.recoverApprovedTask({
+      id: "FN-001",
+      description: "Recovered triage task",
+      column: "triage",
+      status: "planning",
+      dependencies: [],
+      steps: [],
+      currentStep: 0,
+      log: [{ timestamp: "2026-01-01T00:00:00.000Z", action: "Spec review: APPROVE" }],
+      createdAt: "2026-01-01T00:00:00.000Z",
+      updatedAt: "2026-01-01T00:02:00.000Z",
+    });
+
+    expect(recovered).toBe(true);
+    expect(store.updateTask).toHaveBeenCalledWith(
+      "FN-001",
+      expect.objectContaining({
+        sourceMetadataPatch: expect.objectContaining({
+          fileScope: [
+            "packages/core/src/store.ts",
+            "packages/engine/src/scheduler.ts",
+            "packages/dashboard/**",
+          ],
+          intentSignature: expect.objectContaining({
+            filePaths: [
+              "packages/core/src/store.ts",
+              "packages/engine/src/scheduler.ts",
+            ],
+          }),
+        }),
+      }),
+    );
+    const metadataPatch = (store.updateTask as ReturnType<typeof vi.fn>).mock.calls
+      .map(([, patch]) => patch?.sourceMetadataPatch)
+      .find(Boolean);
+    expect(metadataPatch.fileScope).not.toContain("AtlasNotes.xcodeproj/**");
+    expect(metadataPatch.fileScope).not.toContain(".fusion/fusion.db");
+    expect(metadataPatch.fileScope).not.toContain("Packages/*/Package.resolved");
+    expect(metadataPatch.fileScope).not.toContain(".changeset/*.md");
+    expect(metadataPatch.intentSignature.filePaths).not.toContain("AtlasNotes.xcodeproj/**");
+  });
+
   it("updates malformed metadata title from prompt heading when task ID matches", async () => {
     await writeFile(
       join(rootDir, ".fusion", "tasks", "FN-001", "PROMPT.md"),