Run extracted CI classification from its actual checkout root

The full committed-source installtests race run source-8gv7x0gy failed all code-bearing classification cases with exit 127: the extracted workflow invokes scripts/go-test-compile-required.sh relative to the checkout, while Go starts tests in scripts/installtests. Match the Actions working directory without stubbing the classifier, weakening strict audit or changing workflow behaviour.

Contract-Neutral: Verification-only working-directory repair; the existing real workflow cases, classifier and strict/inherited audit contract are unchanged.
Change-source: pulse-maintainer

scripts/installtests/build_release_assets_test.go

@@ -5156,6 +5156,9 @@ func TestFrontendChangeClassificationPreservesStrictAudit(t *testing.T) {
 			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 			defer cancel()
 			cmd := exec.CommandContext(ctx, "bash", "-c", run)
+			// Actions runs this shell from checkout root; its real relative
+			// compile-classifier helper must resolve there, not in this package.
+			cmd.Dir = repoFile()
 			cmd.Env = env
 			result, commandErr := cmd.CombinedOutput()
 			if tc.diffStatus != 0 {