diff --git a/packages/desktop/vitest.config.ts b/packages/desktop/vitest.config.ts
index 7885553dc0..59e5201251 100644
--- a/packages/desktop/vitest.config.ts
+++ b/packages/desktop/vitest.config.ts
@@ -4,6 +4,14 @@ import { computeMaxWorkers } from "../core/src/__test-utils__/vitest-workers";
 
 const maxWorkers = computeMaxWorkers();
 const fusionAliases = {
+  /*
+  FNXC:VitestAliases 2026-07-30-13:10:
+  Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+  rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+  transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+  browser-safe delete-attribution leaf.
+  */
+  "@fusion/core/task-delete-attribution": resolve(__dirname, "../core/src/task-delete-attribution.ts"),
   "@fusion/core": resolve(__dirname, "../core/src/index.ts"),
   "@fusion/dashboard": resolve(__dirname, "../dashboard/src/index.ts"),
   "@fusion/engine": resolve(__dirname, "../engine/src/index.ts"),
diff --git a/packages/engine/vitest.config.ts b/packages/engine/vitest.config.ts
index 598f48b7d4..a4ef94013e 100644
--- a/packages/engine/vitest.config.ts
+++ b/packages/engine/vitest.config.ts
@@ -7,6 +7,14 @@ const maxWorkers = computeMaxWorkers();
 export default defineConfig({
   resolve: {
     alias: {
+      /*
+      FNXC:VitestAliases 2026-07-30-13:10:
+      Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+      rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+      transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+      browser-safe delete-attribution leaf.
+      */
+      "@fusion/core/task-delete-attribution": resolve(__dirname, "../core/src/task-delete-attribution.ts"),
       "@fusion/core": resolve(__dirname, "../core/src/index.ts"),
       "@fusion/test-utils": resolve(__dirname, "../core/src/__test-utils__/workspace.ts"),
       "@fusion/engine": resolve(__dirname, "./src/index.ts"),
diff --git a/plugins/fusion-plugin-cli-printing-press/vitest.config.ts b/plugins/fusion-plugin-cli-printing-press/vitest.config.ts
index 0712c1116e..e9f4487190 100644
--- a/plugins/fusion-plugin-cli-printing-press/vitest.config.ts
+++ b/plugins/fusion-plugin-cli-printing-press/vitest.config.ts
@@ -25,6 +25,14 @@ const quarantinedCliPrintingPressTests = [
 export default defineConfig({
   resolve: {
     alias: {
+      /*
+      FNXC:VitestAliases 2026-07-30-13:10:
+      Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+      rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+      transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+      browser-safe delete-attribution leaf.
+      */
+      "@fusion/core/task-delete-attribution": fileURLToPath(new URL("../../packages/core/src/task-delete-attribution.ts", import.meta.url)),
       "@fusion/core": fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)),
       "@fusion/plugin-sdk": fileURLToPath(new URL("../../packages/plugin-sdk/src/index.ts", import.meta.url)),
       "@fusion/dashboard": fileURLToPath(new URL("../../packages/dashboard/app/index.ts", import.meta.url)),
diff --git a/plugins/fusion-plugin-compound-engineering/vitest.config.ts b/plugins/fusion-plugin-compound-engineering/vitest.config.ts
index 33cf21b46e..4db8348112 100644
--- a/plugins/fusion-plugin-compound-engineering/vitest.config.ts
+++ b/plugins/fusion-plugin-compound-engineering/vitest.config.ts
@@ -45,6 +45,14 @@ export default defineConfig({
         find: /^@fusion-plugin-examples\/compound-engineering$/,
         replacement: fileURLToPath(new URL("./src/index.ts", import.meta.url)),
       },
+      /*
+      FNXC:VitestAliases 2026-07-30-13:10:
+      Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+      rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+      transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+      browser-safe delete-attribution leaf.
+      */
+      { find: "@fusion/core/task-delete-attribution", replacement: fileURLToPath(new URL("../../packages/core/src/task-delete-attribution.ts", import.meta.url)) },
       { find: "@fusion/core", replacement: fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)) },
       {
         find: "@fusion/test-utils/pg-test-harness",
diff --git a/plugins/fusion-plugin-dependency-graph/vitest.config.ts b/plugins/fusion-plugin-dependency-graph/vitest.config.ts
index bba1943043..c39bbb92ec 100644
--- a/plugins/fusion-plugin-dependency-graph/vitest.config.ts
+++ b/plugins/fusion-plugin-dependency-graph/vitest.config.ts
@@ -26,6 +26,14 @@ export default defineConfig({
         find: /^@fusion-plugin-examples\/dependency-graph$/,
         replacement: fileURLToPath(new URL("./src/index.ts", import.meta.url)),
       },
+      /*
+      FNXC:VitestAliases 2026-07-30-13:10:
+      Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+      rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+      transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+      browser-safe delete-attribution leaf.
+      */
+      { find: "@fusion/core/task-delete-attribution", replacement: fileURLToPath(new URL("../../packages/core/src/task-delete-attribution.ts", import.meta.url)) },
       { find: "@fusion/core", replacement: fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)) },
       {
         find: "@fusion/plugin-sdk",
diff --git a/plugins/fusion-plugin-reports/vitest.config.ts b/plugins/fusion-plugin-reports/vitest.config.ts
index 8d252eafec..dbfa9b84dc 100644
--- a/plugins/fusion-plugin-reports/vitest.config.ts
+++ b/plugins/fusion-plugin-reports/vitest.config.ts
@@ -25,6 +25,14 @@ const quarantinedReportsTests = [
 export default defineConfig({
   resolve: {
     alias: {
+      /*
+      FNXC:VitestAliases 2026-07-30-13:10:
+      Must precede the broader `@fusion/core` alias: Vite string aliases match by PREFIX, so that key
+      rewrites this subpath to `index.ts/task-delete-attribution` and resolution fails. Reached here
+      transitively — this project aliases `@fusion/dashboard`, and `app/api/client.ts` imports the
+      browser-safe delete-attribution leaf.
+      */
+      "@fusion/core/task-delete-attribution": fileURLToPath(new URL("../../packages/core/src/task-delete-attribution.ts", import.meta.url)),
       "@fusion/core": fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)),
       // FNXC:Clipboard 2026-07-12-00:00: The reports plugin imports the dashboard clipboard helper through its package subpath export; keep this exact alias ahead of the package root alias so vitest does not collapse the subpath to src/index.ts.
       "@fusion/dashboard/app/utils/copyToClipboard": fileURLToPath(new URL("../../packages/dashboard/app/utils/copyToClipboard.ts", import.meta.url)),