diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 194a5a2..9704a37 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,10 @@ on:
           - full-integration (with examples)
           - all
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: 1
@@ -91,13 +95,11 @@ jobs:
     name: Integration Tests
     runs-on: ubuntu-latest
     timeout-minutes: 15
-    # Always run on push to main/master and PRs, or when manually triggered
+    # Run on all PRs and pushes to main/master, or when manually triggered
     if: >-
+      github.event_name == 'pull_request' ||
       (github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master')) ||
-      github.event_name == 'pull_request' || 
-      (github.event_name == 'workflow_dispatch' && 
-       (github.event.inputs.test_type == 'integration' || 
-        github.event.inputs.test_type == 'all'))
+      github.event_name == 'workflow_dispatch'
 
     services:
       postgres:
@@ -153,13 +155,11 @@ jobs:
     name: Full Integration Tests (with Examples)
     runs-on: ubuntu-latest
     timeout-minutes: 20
-    # Run on main branch, or when manually triggered with 'full-integration' or 'all'
+    # Run on all PRs and pushes to main/master, or when manually triggered
     if: >-
-      github.ref == 'refs/heads/main' || 
-      github.ref == 'refs/heads/master' || 
-      (github.event_name == 'workflow_dispatch' && 
-       (github.event.inputs.test_type == 'full-integration (with examples)' || 
-        github.event.inputs.test_type == 'all'))
+      github.event_name == 'pull_request' ||
+      github.event_name == 'push' ||
+      github.event_name == 'workflow_dispatch'
 
     services:
       postgres:
diff --git a/crates/zart/src/lib.rs b/crates/zart/src/lib.rs
index f475f79..5650072 100644
--- a/crates/zart/src/lib.rs
+++ b/crates/zart/src/lib.rs
@@ -60,7 +60,7 @@
 //!
 //! Register the handler, start a worker, and fire an execution:
 //!
-//! ```rust,ignore
+//! ```text
 //! let mut registry = TaskRegistry::new();
 //! registry.register("onboard-user", OnboardUser);
 //!
diff --git a/crates/zart/src/registry.rs b/crates/zart/src/registry.rs
index 4ba1869..0d4f6c0 100644
--- a/crates/zart/src/registry.rs
+++ b/crates/zart/src/registry.rs
@@ -251,6 +251,11 @@ impl TaskRegistry {
         self.handlers.get(task_name).map(|h| h.as_ref())
     }
 
+    /// Returns the names of all registered handlers (for diagnostics).
+    pub(crate) fn handler_names(&self) -> Vec<&str> {
+        self.handlers.keys().map(|s| s.as_str()).collect()
+    }
+
     /// Execute a registered handler with the given raw JSON data.
     ///
     /// This sets up task-local scoping and delegates to the internal adapter.
diff --git a/crates/zart/src/worker.rs b/crates/zart/src/worker.rs
index 1874fa5..605cffe 100644
--- a/crates/zart/src/worker.rs
+++ b/crates/zart/src/worker.rs
@@ -391,7 +391,11 @@ async fn dispatch_task(
     let handler = match registry.get_handler(&task.task_name) {
         Some(h) => h,
         None => {
-            warn!("No handler registered for task {}", &task.task_name);
+            warn!(
+                "No handler registered for task '{}'; registered handlers: [{}]",
+                &task.task_name,
+                registry.handler_names().join(", ")
+            );
             let _ = scheduler
                 .mark_failed(
                     &task.task_id,