diff --git a/.github/workflows/development-guidance.yml b/.github/workflows/development-guidance.yml
index d95ac3c..51e24b3 100644
--- a/.github/workflows/development-guidance.yml
+++ b/.github/workflows/development-guidance.yml
@@ -2,6 +2,7 @@ name: Validate read-only development guidance
 
 on:
   pull_request:
+    branches: [main]
   push:
     branches: [main]
 
@@ -22,11 +23,3 @@ jobs:
       - name: Run credential-free guidance evaluator regressions
         shell: pwsh
         run: ./tools/Test-DevelopmentGuidanceEvaluator.ps1
-
-      - name: Validate and prepare implementation-guidance fixtures
-        shell: pwsh
-        run: ./tools/Test-DevelopmentGuidanceFixtures.ps1 -Root . -ManifestPath ./evaluation/implementation-guidance-fixtures.json -PrepareDirectory "$env:RUNNER_TEMP/bcquality-implementation-guidance-fixtures"
-
-      - name: Run implementation-guidance evaluator regressions
-        shell: pwsh
-        run: ./tools/Test-ImplementationGuidanceEvaluator.ps1
diff --git a/tools/Test-DevelopmentGuidanceEvaluator.ps1 b/tools/Test-DevelopmentGuidanceEvaluator.ps1
index 1bce91d..ad18d77 100644
--- a/tools/Test-DevelopmentGuidanceEvaluator.ps1
+++ b/tools/Test-DevelopmentGuidanceEvaluator.ps1
@@ -421,4 +421,6 @@ try {
 }
 
 # Intentional negative native-command probes leave LASTEXITCODE nonzero.
+& (Join-Path $PSScriptRoot 'Test-ImplementationGuidanceEvaluator.ps1')
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
 exit 0