Stop quarantine-list edits from forcing pnpm test into gate mode

scripts/lib/test-quarantine.json is runtime data (which tests are
quarantined), not executable test infra, but it tripped the shared-infra
catch-all in isSharedInfraChange. That forced mode=gate, which runs only
the fixed engine-core + cli-shape gate suite and returns before the
affected packages -- so a dev's real changes (e.g. @fusion/core,
@fusion/dashboard) got zero coverage whenever they also touched the
quarantine list. Classify the file as test-irrelevant so the diff stays
in changed mode and the affected packages run.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.changeset/fix-quarantine-json-gate-mode.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Stop edits to `scripts/lib/test-quarantine.json` from forcing `pnpm test` into gate mode. The quarantine list is runtime data, not executable test infra; tripping the shared-infra catch-all dropped affected-package coverage, so a dev's real changes went untested whenever they also touched the quarantine list. Quarantine edits now stay in changed mode and run the affected packages.

scripts/__tests__/test-changed.test.mjs

@@ -148,6 +148,26 @@ test("isSharedInfraChange: returns false for .fusion artifacts", () => {
   assert.equal(isSharedInfraChange([".fusion/tasks/FN-5157/PROMPT.md"]), false);
 });
 
+test("isSharedInfraChange: returns false for the test-quarantine data list", () => {
+  // FN: editing scripts/lib/test-quarantine.json (a runtime data list of
+  // quarantined tests, not executable infra) previously tripped the root
+  // catch-all and forced gate mode, which DROPS affected-package coverage.
+  assert.equal(isSharedInfraChange(["scripts/lib/test-quarantine.json"]), false);
+});
+
+test("isSharedInfraChange: quarantine edit plus package change stays changed-only", () => {
+  // A quarantine-list edit alongside real package work must keep the diff in
+  // changed mode so the changed packages actually get tested.
+  assert.equal(
+    isSharedInfraChange([
+      "scripts/lib/test-quarantine.json",
+      "packages/core/src/productivity-analytics.ts",
+      "packages/dashboard/app/components/QuickEntryBox.tsx",
+    ]),
+    false,
+  );
+});
+
 test("isSharedInfraChange: still returns true for root config edges", () => {
   for (const file of ["tsconfig.json", ".npmrc", "Dockerfile"]) {
     assert.equal(isSharedInfraChange([file]), true, `${file} should still force the full suite`);

scripts/test-changed.mjs

@@ -604,6 +604,14 @@ function isTestIrrelevantRootPath(file) {
     return true;
   }
 
+  // The quarantine list is runtime DATA (which tests are skipped), not
+  // executable test infra. Editing it must not trip the root catch-all below
+  // and force gate mode — gate mode drops affected-package coverage, so a
+  // dev's real changes would go untested just because they touched the list.
+  if (file === "scripts/lib/test-quarantine.json") {
+    return true;
+  }
+
   return ["README", "CHANGELOG.md", "LICENSE", "LICENSE.md"].includes(file);
 }