diff --git a/%plugin_name%.php b/%plugin_name%.php
index 4d3d511..664bd26 100644
--- a/%plugin_name%.php
+++ b/%plugin_name%.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Plugin Name: %plugin_name%
  * Plugin URI: %plugin_uri%
diff --git a/.github/workflows/harness.yml b/.github/workflows/harness.yml
new file mode 100644
index 0000000..5341df9
--- /dev/null
+++ b/.github/workflows/harness.yml
@@ -0,0 +1,17 @@
+name: Harness
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  harness:
+    uses: Pollora/harness/.github/workflows/template.yml@v0.1.11
+    with:
+      mode: enforce
+    permissions:
+      contents: read
diff --git a/bin/ci/check-install.php b/bin/ci/check-install.php
index 27ef49c..40f89a8 100644
--- a/bin/ci/check-install.php
+++ b/bin/ci/check-install.php
@@ -71,7 +71,7 @@ function test(string $name, callable $fn): void
 
     try {
         $result = $fn();
-    } catch (\Throwable $e) {
+    } catch (Throwable $e) {
         echo "  \033[31m✗\033[0m  {$name} — {$e->getMessage()}\n";
         $failed++;
 
@@ -97,7 +97,7 @@ function run(string $command): array
     $process = proc_open($command.' 2>&1', $descriptors, $pipes);
 
     if (! is_resource($process)) {
-        throw new \RuntimeException("could not run: {$command}");
+        throw new RuntimeException("could not run: {$command}");
     }
 
     $out = stream_get_contents($pipes[1]) ?: '';
@@ -112,7 +112,7 @@ function wpEval(string $php): string
     $result = run('wp eval '.escapeshellarg($php));
 
     if ($result['code'] !== 0) {
-        throw new \RuntimeException("wp eval failed: {$result['out']}");
+        throw new RuntimeException("wp eval failed: {$result['out']}");
     }
 
     return $result['out'];
@@ -176,14 +176,14 @@ function ensureActiveTheme(): void
             .' --theme-version=1.0.0 --no-interaction');
 
         if ($scaffold['code'] !== 0) {
-            throw new \RuntimeException("could not scaffold a theme: {$scaffold['out']}");
+            throw new RuntimeException("could not scaffold a theme: {$scaffold['out']}");
         }
 
         $installed = array_values(array_filter(explode("\n", run('wp theme list --field=name')['out'])));
     }
 
     if ($installed === []) {
-        throw new \RuntimeException('the site still has no theme after scaffolding one');
+        throw new RuntimeException('the site still has no theme after scaffolding one');
     }
 
     $active = run('wp theme list --status=active --field=name')['out'];
@@ -195,7 +195,7 @@ function ensureActiveTheme(): void
     $activated = run('wp theme activate '.escapeshellarg($installed[0]));
 
     if ($activated['code'] !== 0) {
-        throw new \RuntimeException("could not activate {$installed[0]}: {$activated['out']}");
+        throw new RuntimeException("could not activate {$installed[0]}: {$activated['out']}");
     }
 }
 
@@ -210,7 +210,7 @@ function pluginsDirectory(): string
     $path = wpEval('echo WP_PLUGIN_DIR;');
 
     if ($path === '' || ! is_dir($path)) {
-        throw new \RuntimeException("WP_PLUGIN_DIR is {$path}, which does not exist");
+        throw new RuntimeException("WP_PLUGIN_DIR is {$path}, which does not exist");
     }
 
     return $path;
diff --git a/bin/replacements.php b/bin/replacements.php
index 3e440f2..8f81971 100644
--- a/bin/replacements.php
+++ b/bin/replacements.php
@@ -19,7 +19,7 @@
  * placeholder the scaffolder does not substitute": a key that disappears here
  * or a token that appears in the template without a key both fail it.
  *
- * @return array<string, string>  placeholder => a plausible substituted value
+ * @return array<string, string> placeholder => a plausible substituted value
  */
 function scaffolderReplacements(string $name = 'my-plugin'): array
 {
diff --git a/bin/tests/compat.php b/bin/tests/compat.php
index a359907..3d448f9 100644
--- a/bin/tests/compat.php
+++ b/bin/tests/compat.php
@@ -39,7 +39,7 @@ function scaffoldedPluginFile(): string
     $source = pluginPath('%plugin_name%.php');
 
     if (! is_file($source)) {
-        throw new \RuntimeException('the template has no %plugin_name%.php — the main file was renamed');
+        throw new RuntimeException('the template has no %plugin_name%.php — the main file was renamed');
     }
 
     $replacements = scaffolderReplacements(TEST_SLUG);
@@ -131,7 +131,7 @@ function checkRegistrationGuard(): void
 
         return str_starts_with($result['out'], 'pollora_register:plugin:'.TEST_SLUG)
             ? true
-            : "expected pollora_register:plugin:".TEST_SLUG.", got '{$result['out']}'";
+            : 'expected pollora_register:plugin:'.TEST_SLUG.", got '{$result['out']}'";
     });
 
     test('Framework >= 13.32: does not also call the registrar', function () {
@@ -151,7 +151,7 @@ function checkRegistrationGuard(): void
 
         return str_starts_with($result['out'], 'registrar::register:'.TEST_SLUG)
             ? true
-            : "expected registrar::register:".TEST_SLUG.", got '{$result['out']}'";
+            : 'expected registrar::register:'.TEST_SLUG.", got '{$result['out']}'";
     });
 
     test('Neither is available: leaves the plugin unregistered, without a fatal', function () {
diff --git a/bin/tests/contract.php b/bin/tests/contract.php
index 0a2b5e8..be7d253 100644
--- a/bin/tests/contract.php
+++ b/bin/tests/contract.php
@@ -24,7 +24,7 @@
 const CODE_NAMES = ['pollora-demo-plugin', 'PolloraDemoPlugin', 'pollora_demo_plugin', 'POLLORA_DEMO_PLUGIN'];
 
 /**
- * @return array<int, string>  every shipped file, repository-relative
+ * @return array<int, string> every shipped file, repository-relative
  */
 function shippedFiles(): array
 {
diff --git a/bin/tests/lib.php b/bin/tests/lib.php
index 78c8b3b..c50fb8e 100644
--- a/bin/tests/lib.php
+++ b/bin/tests/lib.php
@@ -13,7 +13,6 @@
  * A check returns true (pass), or a string explaining the failure. There is no
  * skip: a check that cannot fail is the defect this suite exists to prevent.
  */
-
 final class Results
 {
     public static int $passed = 0;
@@ -35,7 +34,7 @@ function test(string $name, callable $fn): void
 {
     try {
         $result = $fn();
-    } catch (\Throwable $e) {
+    } catch (Throwable $e) {
         echo "  \033[31m✗\033[0m  {$name} — {$e->getMessage()}\n";
         Results::$failed++;
 
@@ -99,7 +98,7 @@ function phpRun(string $code): array
     if (! is_resource($process)) {
         unlink($file);
 
-        throw new \RuntimeException('could not start a PHP process');
+        throw new RuntimeException('could not start a PHP process');
     }
 
     $out = stream_get_contents($pipes[1]) ?: '';