diff --git a/docs/javascript-artifact-reconstruction.md b/docs/javascript-artifact-reconstruction.md
index 09658409f9..bd933421a8 100644
--- a/docs/javascript-artifact-reconstruction.md
+++ b/docs/javascript-artifact-reconstruction.md
@@ -246,6 +246,10 @@ waiting before receiving the reply, follow [MCP cancellation recovery](mcp-contr
 to find the record. CLI failure output contains the complete partial Evidence.
 Owned analyzer cleanup is verified before private files are released; uncertain
 cleanup retains ownership for retry and is reported separately.
+Typed cancellation or another primary interruption remains attached while
+cleanup is incomplete. Confirmed release restores that primary classification,
+including the caller's exact cancellation reason, while retaining partial
+application Evidence and historical cleanup diagnostics.
 
 Private worker storage failures retain the source identity, worker phase and
 reported I/O message as execution failures; they are distinct from malformed
diff --git a/src/application/javascript/JavaScriptArtifactReconstruction.ts b/src/application/javascript/JavaScriptArtifactReconstruction.ts
index 50aaa1805c..c447cf1c61 100644
--- a/src/application/javascript/JavaScriptArtifactReconstruction.ts
+++ b/src/application/javascript/JavaScriptArtifactReconstruction.ts
@@ -23,6 +23,7 @@ import type { JavaScriptSourceSelection } from "../../domain/javascript/javascri
 import type { ElectronBoundarySummary } from "../../domain/javascript/javascriptApplicationAnalysis.js";
 import { parseOwnedJavaScriptApplicationAnalysisSteps } from "../../domain/javascript/javascriptApplicationAnalysis.js";
 import { AnalysisError } from "../../domain/analysisErrorBase.js";
+import { analysisErrorWithCleanupFailure } from "../../domain/analysisErrorCleanup.js";
 import { ArtifactOperationError } from "../../domain/artifactOperationError.js";
 import type { ArtifactInventorySnapshot } from "../../domain/artifactInventorySnapshot.js";
 import type { ArtifactInventoryPartialObservation } from "../../domain/artifactPartialObservation.js";
@@ -232,7 +233,7 @@ export const reconstructJavaScriptArtifact = async (
         }
       }
       const analysis = outcome.analysis;
-      let interruption = cleanupFailure ?? outcome.interruption;
+      let interruption = outcome.interruption;
       // Source facts are owned now. Finish their projection cooperatively so a
       // later cancellation can retain Evidence instead of discarding those facts.
       const checkpointCompletedAnalysis = async (): Promise<void> => {
@@ -251,7 +252,7 @@ export const reconstructJavaScriptArtifact = async (
         message: string,
       ): Promise<void> => {
         await checkpointCompletedAnalysis();
-        if (interruption == null)
+        if (interruption == null && cleanupFailure === undefined)
           await progress?.report({ phase, completed: 0, total: 1, message });
         await checkpointCompletedAnalysis();
       };
@@ -373,7 +374,17 @@ export const reconstructJavaScriptArtifact = async (
         limitations: analysis.limitations,
       };
       await checkpointCompletedAnalysis();
-      if (interruption !== null && interruption !== undefined) {
+      const failure =
+        cleanupFailure === undefined
+          ? interruption
+          : interruption === null
+            ? cleanupFailure
+            : analysisErrorWithCleanupFailure(
+                interruption,
+                cleanupFailure,
+                OPERATION,
+              ).bindCleanupDependencies([interruption, cleanupFailure]);
+      if (failure !== null) {
         const { electron_summary: summary, ...application } = completed;
         const partial = await completeJavaScriptAnalysisSteps(
           parseOwnedJavaScriptApplicationAnalysisSteps({
@@ -387,7 +398,7 @@ export const reconstructJavaScriptArtifact = async (
             input,
             partial,
           );
-        throw interruption.retainPartialObservation(evidence);
+        throw failure.retainPartialObservation(evidence);
       }
       reconstructionOutcome = { kind: "completed", result: completed };
     } catch (cause: unknown) {
diff --git a/src/javascript/analysis/JavaScriptAnalysisWorker.ts b/src/javascript/analysis/JavaScriptAnalysisWorker.ts
index f337d82452..b272371610 100644
--- a/src/javascript/analysis/JavaScriptAnalysisWorker.ts
+++ b/src/javascript/analysis/JavaScriptAnalysisWorker.ts
@@ -1194,6 +1194,7 @@ export class JavaScriptAnalysisWorker {
       },
       {
         operation: OPERATION,
+        ...(original === undefined ? {} : { cleanupPrimary: original }),
         cause: new Error(
           reason,
           original === undefined ? undefined : { cause: original },
diff --git a/tests/boundary/javascript/javascriptApplicationCancellation.test.ts b/tests/boundary/javascript/javascriptApplicationCancellation.test.ts
index f488a4d551..3183738cd6 100644
--- a/tests/boundary/javascript/javascriptApplicationCancellation.test.ts
+++ b/tests/boundary/javascript/javascriptApplicationCancellation.test.ts
@@ -1,7 +1,7 @@
 import { setImmediate } from "node:timers";
 import { mkdir, open, realpath, symlink, writeFile } from "node:fs/promises";
-import { join } from "node:path";
-import { expect, it, onTestFinished } from "vitest";
+import { basename, join } from "node:path";
+import { expect, it, onTestFinished, vi } from "vitest";
 import { z } from "zod";
 import {
   ArtifactResourceScope,
@@ -13,6 +13,87 @@ import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
 import { projectAnalysisError } from "../../../src/domain/analysisErrorProjection.js";
 import { AnalysisOutputError } from "../../../src/domain/analysisErrorCore.js";
 import { analyzeJavaScriptApplication } from "../../support/javascriptApplicationScope.js";
+import { PrivateRuntimeRoot } from "../../../src/process/PrivateRuntimeRoot.js";
+import { JavaScriptAnalysisWorker } from "../../../src/javascript/analysis/JavaScriptAnalysisWorker.js";
+
+it.each(["worker-phase", "final-cleanup", "no-cancellation"] as const)(
+  "preserves the primary through failed worker cleanup and exact-owner retry: %s",
+  async (timing) => {
+    const root = await createTestTempDirectory("rea-js-primary-cleanup-");
+    await writeFile(join(root, "main.js"), "export const observed = 7;");
+    const controller = new AbortController();
+    const reason = { request: "cancelled while worker resources remain owned" };
+    let denyRemoval = true;
+    let runtimePath: string | undefined;
+    const originalClose = PrivateRuntimeRoot.prototype.close;
+    const close = vi
+      .spyOn(PrivateRuntimeRoot.prototype, "close")
+      .mockImplementation(async function (this: PrivateRuntimeRoot) {
+        if (basename(this.path).startsWith("rea-javascript-analysis-")) {
+          runtimePath = this.path;
+          if (timing === "final-cleanup") controller.abort(reason);
+          if (denyRemoval)
+            throw new Error(
+              "controlled JavaScript worker root removal failure",
+            );
+        }
+        await originalClose.call(this);
+      });
+    // Exercise physical finalization even after the one healthy source finishes.
+    const reuse = vi
+      .spyOn(JavaScriptAnalysisWorker.prototype, "canReuse")
+      .mockReturnValue(false);
+    const scope = new ArtifactResourceScope();
+    onTestFinished(async () => {
+      denyRemoval = false;
+      try {
+        await scope.close();
+      } finally {
+        close.mockRestore();
+        reuse.mockRestore();
+      }
+    });
+    const result = await analyzeOwnedApplication(
+      { input_path: root, format: "directory" },
+      scope,
+      {
+        signal: controller.signal,
+        progress: {
+          async report(event) {
+            if (
+              timing === "worker-phase" &&
+              event.phase.startsWith("javascript_worker_")
+            )
+              controller.abort(reason);
+          },
+        },
+      },
+    );
+    if (result.ok) throw new Error("Expected cleanup failure");
+    expect(runtimePath).toBeDefined();
+    expect(result.error.cleanupIncomplete).toBe(true);
+    expect(result.error.cleanupResources).toContain(runtimePath);
+    expect(projectAnalysisError(result.error)).toMatchObject({
+      code: "cleanup_incomplete",
+      details: { partial_observation: expect.any(Object) },
+    });
+    if (timing !== "no-cancellation") {
+      expect(result.error.cleanupPrimary).toBeDefined();
+      expect(result.error.cleanupPrimary?.cause).toBe(reason);
+    }
+    denyRemoval = false;
+    await scope.close();
+    expect(result.error.cleanupIncomplete).toBe(false);
+    expect(result.error.cleanupResources).toEqual([]);
+    const projected = projectAnalysisError(result.error);
+    expect(projected.code).toBe(
+      timing === "no-cancellation" ? "execution_failure" : "cancelled",
+    );
+    expect(projected.details).toMatchObject({
+      partial_observation: expect.any(Object),
+    });
+  },
+);
 
 it.each(["during cleanup", "on the next control turn"] as const)(
   "retains the final source when cancellation arrives %s after analysis",