diff --git a/wfe-buildkit/tests/integration_test.rs b/wfe-buildkit/tests/integration_test.rs
index fd09ef5..7fc1610 100644
--- a/wfe-buildkit/tests/integration_test.rs
+++ b/wfe-buildkit/tests/integration_test.rs
@@ -73,6 +73,7 @@ async fn build_simple_dockerfile_via_grpc() {
     let (ws, pointer, instance) = make_test_context("integration-build");
     let cancel = tokio_util::sync::CancellationToken::new();
     let ctx = StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -157,6 +158,7 @@ async fn build_with_build_args() {
     let (ws, pointer, instance) = make_test_context("build-args-test");
     let cancel = tokio_util::sync::CancellationToken::new();
     let ctx = StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -208,6 +210,7 @@ async fn connect_to_unavailable_daemon_returns_error() {
     let (ws, pointer, instance) = make_test_context("error-test");
     let cancel = tokio_util::sync::CancellationToken::new();
     let ctx = StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
diff --git a/wfe-containerd/tests/integration.rs b/wfe-containerd/tests/integration.rs
index f7bd062..28a71b6 100644
--- a/wfe-containerd/tests/integration.rs
+++ b/wfe-containerd/tests/integration.rs
@@ -68,6 +68,7 @@ fn make_context<'a>(
     pointer: &'a ExecutionPointer,
 ) -> StepExecutionContext<'a> {
     StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: pointer,
         persistence_data: None,
diff --git a/wfe-core/src/test_support/lock_suite.rs b/wfe-core/src/test_support/lock_suite.rs
index 5084138..744e35d 100644
--- a/wfe-core/src/test_support/lock_suite.rs
+++ b/wfe-core/src/test_support/lock_suite.rs
@@ -44,6 +44,39 @@ macro_rules! lock_suite {
                 // Should not error even if lock was never acquired
                 provider.release_lock("nonexistent").await.unwrap();
             }
+
+            #[tokio::test]
+            async fn different_resources_are_independent() {
+                let provider = ($factory)().await;
+                assert!(provider.acquire_lock("resource-a").await.unwrap());
+                // Different resource id doesn't block on the first.
+                assert!(provider.acquire_lock("resource-b").await.unwrap());
+                // Now trying to reacquire either fails while held.
+                assert!(!provider.acquire_lock("resource-a").await.unwrap());
+                assert!(!provider.acquire_lock("resource-b").await.unwrap());
+                provider.release_lock("resource-a").await.unwrap();
+                provider.release_lock("resource-b").await.unwrap();
+            }
+
+            #[tokio::test]
+            async fn start_and_stop_lifecycle_are_idempotent() {
+                let provider = ($factory)().await;
+                provider.start().await.unwrap();
+                provider.start().await.unwrap();
+                provider.stop().await.unwrap();
+                provider.stop().await.unwrap();
+            }
+
+            #[tokio::test]
+            async fn acquire_release_acquire_roundtrip() {
+                let provider = ($factory)().await;
+                for _ in 0..5 {
+                    assert!(provider.acquire_lock("cycling").await.unwrap());
+                    provider.release_lock("cycling").await.unwrap();
+                }
+                assert!(provider.acquire_lock("cycling").await.unwrap());
+                assert!(!provider.acquire_lock("cycling").await.unwrap());
+            }
         }
     };
 }
diff --git a/wfe-core/src/test_support/persistence_suite.rs b/wfe-core/src/test_support/persistence_suite.rs
index c6f51ed..22230c6 100644
--- a/wfe-core/src/test_support/persistence_suite.rs
+++ b/wfe-core/src/test_support/persistence_suite.rs
@@ -238,6 +238,379 @@ macro_rules! persistence_suite {
                     assert_eq!(w.id, *id);
                 }
             }
+
+            // ─── 1.9 name / sequence / root_workflow_id coverage ────────
+
+            #[tokio::test]
+            async fn next_definition_sequence_is_monotonic_per_definition() {
+                let provider = ($factory)().await;
+
+                // Persistent backends (postgres) keep the sequence counter
+                // table across test runs, so we need unique definition ids
+                // per test invocation to get deterministic starting values.
+                let id_a = format!(
+                    "ci-{}",
+                    std::time::SystemTime::now()
+                        .duration_since(std::time::UNIX_EPOCH)
+                        .unwrap()
+                        .as_nanos()
+                );
+                let id_b = format!("{id_a}-other");
+
+                // First definition counter starts at 1 and increments.
+                assert_eq!(provider.next_definition_sequence(&id_a).await.unwrap(), 1);
+                assert_eq!(provider.next_definition_sequence(&id_a).await.unwrap(), 2);
+                assert_eq!(provider.next_definition_sequence(&id_a).await.unwrap(), 3);
+
+                // Second definition has an independent counter.
+                assert_eq!(provider.next_definition_sequence(&id_b).await.unwrap(), 1);
+                assert_eq!(provider.next_definition_sequence(&id_b).await.unwrap(), 2);
+
+                // First definition's counter unaffected.
+                assert_eq!(provider.next_definition_sequence(&id_a).await.unwrap(), 4);
+            }
+
+            #[tokio::test]
+            async fn get_workflow_instance_by_name_resolves_human_name() {
+                let provider = ($factory)().await;
+
+                let mut w = WorkflowInstance::new("test-wf", 1, serde_json::json!({}));
+                w.name = "ci-42".into();
+                let id = provider.create_new_workflow(&w).await.unwrap();
+
+                // Fetch by human name returns the same row as fetch-by-id.
+                let by_name = provider.get_workflow_instance_by_name("ci-42").await.unwrap();
+                assert_eq!(by_name.id, id);
+                assert_eq!(by_name.name, "ci-42");
+
+                // Nonexistent name surfaces WorkflowNotFound.
+                let missing = provider
+                    .get_workflow_instance_by_name("no-such-name")
+                    .await;
+                assert!(missing.is_err());
+            }
+
+            #[tokio::test]
+            async fn root_workflow_id_persists_across_save_and_load() {
+                let provider = ($factory)().await;
+
+                let parent_id = {
+                    let mut p = WorkflowInstance::new("parent", 1, serde_json::json!({}));
+                    p.name = "parent-1".into();
+                    provider.create_new_workflow(&p).await.unwrap()
+                };
+
+                let mut child = WorkflowInstance::new("child", 1, serde_json::json!({}));
+                child.name = "child-1".into();
+                child.root_workflow_id = Some(parent_id.clone());
+                let child_id = provider.create_new_workflow(&child).await.unwrap();
+
+                let loaded = provider.get_workflow_instance(&child_id).await.unwrap();
+                assert_eq!(loaded.root_workflow_id.as_deref(), Some(parent_id.as_str()));
+
+                // Round-trip through persist_workflow too.
+                let mut updated = loaded.clone();
+                updated.description = Some("updated".into());
+                provider.persist_workflow(&updated).await.unwrap();
+                let reloaded = provider.get_workflow_instance(&child_id).await.unwrap();
+                assert_eq!(
+                    reloaded.root_workflow_id.as_deref(),
+                    Some(parent_id.as_str())
+                );
+                assert_eq!(reloaded.description.as_deref(), Some("updated"));
+            }
+
+            // ─── Additional SubscriptionRepository coverage ────────────
+
+            #[tokio::test]
+            async fn subscription_token_lifecycle() {
+                let provider = ($factory)().await;
+                let now = Utc::now();
+                let sub =
+                    EventSubscription::new("wf-1", 0, "ptr-1", "evt", "key", now);
+                let id = provider.create_event_subscription(&sub).await.unwrap();
+
+                // Claim the subscription with a token — returns true on success.
+                let claimed = provider
+                    .set_subscription_token(&id, "tok-a", "worker-1", now + Duration::seconds(30))
+                    .await
+                    .unwrap();
+                assert!(claimed);
+
+                // A second set_subscription_token with a different token while
+                // the first is still held should fail to claim.
+                let reclaimed = provider
+                    .set_subscription_token(&id, "tok-b", "worker-2", now + Duration::seconds(30))
+                    .await
+                    .unwrap_or(false);
+                assert!(!reclaimed, "token should not be reclaimed while still held");
+
+                // Clearing with the correct token releases the subscription.
+                provider.clear_subscription_token(&id, "tok-a").await.unwrap();
+
+                // Now another worker can claim it.
+                let re = provider
+                    .set_subscription_token(&id, "tok-b", "worker-2", now + Duration::seconds(30))
+                    .await
+                    .unwrap();
+                assert!(re);
+            }
+
+            #[tokio::test]
+            async fn get_first_open_subscription_returns_unlocked_only() {
+                let provider = ($factory)().await;
+                let now = Utc::now();
+
+                // Two subscriptions matching the same (event_name, event_key)
+                // — the first gets claimed, then get_first_open should return
+                // the second.
+                let sub1 =
+                    EventSubscription::new("wf-1", 0, "p1", "order.created", "k", now);
+                let id1 = provider.create_event_subscription(&sub1).await.unwrap();
+                let sub2 =
+                    EventSubscription::new("wf-2", 0, "p2", "order.created", "k", now);
+                let _id2 = provider.create_event_subscription(&sub2).await.unwrap();
+
+                provider
+                    .set_subscription_token(&id1, "tok", "w", now + Duration::seconds(30))
+                    .await
+                    .unwrap();
+
+                let first_open = provider
+                    .get_first_open_subscription("order.created", "k", now + Duration::seconds(1))
+                    .await
+                    .unwrap();
+                assert!(first_open.is_some());
+                // The open one is the un-claimed wf-2, not the claimed wf-1.
+                let open = first_open.unwrap();
+                assert_eq!(open.workflow_id, "wf-2");
+            }
+
+            #[tokio::test]
+            async fn persist_workflow_with_subscriptions_round_trip() {
+                let provider = ($factory)().await;
+                let mut w = WorkflowInstance::new("sub-wf", 1, serde_json::json!({}));
+                let id = provider.create_new_workflow(&w).await.unwrap();
+                w.id = id.clone();
+
+                let now = Utc::now();
+                let subs = vec![
+                    EventSubscription::new(&id, 0, "p-0", "a.evt", "k1", now),
+                    EventSubscription::new(&id, 1, "p-1", "b.evt", "k2", now),
+                ];
+                provider
+                    .persist_workflow_with_subscriptions(&w, &subs)
+                    .await
+                    .unwrap();
+
+                let fetched = provider
+                    .get_subscriptions("a.evt", "k1", now + Duration::seconds(1))
+                    .await
+                    .unwrap();
+                assert_eq!(fetched.len(), 1);
+                assert_eq!(fetched[0].workflow_id, id);
+            }
+
+            // ─── Additional EventRepository coverage ────────────────────
+
+            #[tokio::test]
+            async fn mark_event_unprocessed_reverses_processed_flag() {
+                let provider = ($factory)().await;
+                let event = Event::new("evt", "key", serde_json::json!(null));
+                let id = provider.create_event(&event).await.unwrap();
+
+                provider.mark_event_processed(&id).await.unwrap();
+                let processed = provider.get_event(&id).await.unwrap();
+                assert!(processed.is_processed);
+
+                provider.mark_event_unprocessed(&id).await.unwrap();
+                let unprocessed = provider.get_event(&id).await.unwrap();
+                assert!(!unprocessed.is_processed);
+            }
+
+            #[tokio::test]
+            async fn get_events_returns_matching_ids() {
+                let provider = ($factory)().await;
+                let now = Utc::now();
+
+                let e1 = Event::new("foo.created", "abc", serde_json::json!({}));
+                let id1 = provider.create_event(&e1).await.unwrap();
+                let e2 = Event::new("foo.created", "xyz", serde_json::json!({}));
+                let _id2 = provider.create_event(&e2).await.unwrap();
+                let e3 = Event::new("bar.created", "abc", serde_json::json!({}));
+                let _id3 = provider.create_event(&e3).await.unwrap();
+
+                let matching = provider
+                    .get_events("foo.created", "abc", now + Duration::seconds(1))
+                    .await
+                    .unwrap();
+                assert!(matching.contains(&id1));
+                assert_eq!(matching.len(), 1);
+            }
+
+            // ─── get_workflow_instances (batch fetch) ─────────────────
+
+            #[tokio::test]
+            async fn get_workflow_instances_fetches_multiple_by_id() {
+                let provider = ($factory)().await;
+
+                let w1 = WorkflowInstance::new("a", 1, serde_json::json!({}));
+                let id1 = provider.create_new_workflow(&w1).await.unwrap();
+                let w2 = WorkflowInstance::new("b", 1, serde_json::json!({}));
+                let id2 = provider.create_new_workflow(&w2).await.unwrap();
+                let w3 = WorkflowInstance::new("c", 1, serde_json::json!({}));
+                let id3 = provider.create_new_workflow(&w3).await.unwrap();
+
+                let fetched = provider
+                    .get_workflow_instances(&[id1.clone(), id2.clone(), id3.clone()])
+                    .await
+                    .unwrap();
+                assert_eq!(fetched.len(), 3);
+
+                // Missing ids are silently filtered out.
+                let partial = provider
+                    .get_workflow_instances(&[id1.clone(), "never".into()])
+                    .await
+                    .unwrap();
+                assert_eq!(partial.len(), 1);
+                assert_eq!(partial[0].id, id1);
+            }
+
+            // ─── WorkflowNotFound on bogus id ─────────────────────────
+
+            #[tokio::test]
+            async fn get_workflow_instance_missing_is_workflow_not_found() {
+                let provider = ($factory)().await;
+                let err = provider
+                    .get_workflow_instance("definitely-not-an-id")
+                    .await
+                    .unwrap_err();
+                assert!(matches!(err, $crate::WfeError::WorkflowNotFound(_)));
+            }
+
+            // ─── ensure_store_exists idempotency ──────────────────────
+
+            #[tokio::test]
+            async fn ensure_store_exists_is_idempotent() {
+                let provider = ($factory)().await;
+                // Calling twice in a row should not error (schema already there).
+                provider.ensure_store_exists().await.unwrap();
+                provider.ensure_store_exists().await.unwrap();
+            }
+
+            // ─── Execution pointer round-trip ──────────────────────────
+            //
+            // Pointers carry the bulk of the per-step state and touch the
+            // trickiest serialization paths (persistence_data, event_data,
+            // scope, children, extension_attributes). Explicitly round-trip
+            // one through create → update → fetch to catch marshalling bugs.
+
+            #[tokio::test]
+            async fn execution_pointer_round_trip() {
+                use $crate::models::{ExecutionPointer, PointerStatus};
+
+                let provider = ($factory)().await;
+
+                let mut instance =
+                    WorkflowInstance::new("ptr-test", 1, serde_json::json!({}));
+                let mut ptr = ExecutionPointer::new(0);
+                ptr.status = PointerStatus::Running;
+                ptr.step_name = Some("first".into());
+                ptr.persistence_data = Some(serde_json::json!({"cursor": 7}));
+                ptr.event_name = Some("order.paid".into());
+                ptr.event_key = Some("order-42".into());
+                ptr.event_published = false;
+                ptr.retry_count = 2;
+                ptr.scope = vec!["parent-scope".into()];
+                ptr.children = vec!["child-a".into(), "child-b".into()];
+                ptr.extension_attributes = {
+                    let mut m = std::collections::HashMap::new();
+                    m.insert("owner".to_string(), serde_json::json!("alice"));
+                    m
+                };
+                instance.execution_pointers.push(ptr);
+
+                let id = provider.create_new_workflow(&instance).await.unwrap();
+                let fetched = provider.get_workflow_instance(&id).await.unwrap();
+
+                assert_eq!(fetched.execution_pointers.len(), 1);
+                let out = &fetched.execution_pointers[0];
+                assert_eq!(out.status, PointerStatus::Running);
+                assert_eq!(out.step_name.as_deref(), Some("first"));
+                assert_eq!(
+                    out.persistence_data.as_ref().map(|v| v["cursor"].as_u64()),
+                    Some(Some(7))
+                );
+                assert_eq!(out.event_name.as_deref(), Some("order.paid"));
+                assert_eq!(out.retry_count, 2);
+                assert_eq!(out.scope, vec!["parent-scope".to_string()]);
+                assert_eq!(out.children.len(), 2);
+                assert_eq!(
+                    out.extension_attributes.get("owner"),
+                    Some(&serde_json::json!("alice"))
+                );
+            }
+
+            // ─── ScheduledCommandRepository ────────────────────────────
+
+            #[tokio::test]
+            async fn scheduled_commands_round_trip_when_supported() {
+                use $crate::models::{CommandName, ScheduledCommand};
+                use $crate::traits::ScheduledCommandRepository;
+
+                let provider = ($factory)().await;
+
+                // Some backends (postgres, sqlite) support scheduled
+                // commands; others don't. Skip the test cleanly on backends
+                // that report no support rather than forcing a hard-coded
+                // opt-in list here.
+                if !provider.supports_scheduled_commands() {
+                    return;
+                }
+
+                // Use a unique data payload so the UNIQUE(command_name, data)
+                // index doesn't collide with previous runs on persistent
+                // backends.
+                let unique = format!(
+                    "payload-{}",
+                    std::time::SystemTime::now()
+                        .duration_since(std::time::UNIX_EPOCH)
+                        .unwrap()
+                        .as_nanos()
+                );
+                let cmd = ScheduledCommand {
+                    command_name: CommandName::ProcessWorkflow,
+                    data: unique.clone(),
+                    execute_time: 0,
+                };
+                provider.schedule_command(&cmd).await.unwrap();
+
+                // Double-scheduling the same (command_name, data) must not
+                // blow up — the implementation uses ON CONFLICT DO NOTHING
+                // semantics so this is idempotent.
+                provider.schedule_command(&cmd).await.unwrap();
+
+                // Process due commands at a point well past execute_time.
+                let processed = std::sync::Arc::new(std::sync::atomic::AtomicUsize::new(0));
+                let counter = processed.clone();
+                provider
+                    .process_commands(
+                        Utc::now() + Duration::seconds(1),
+                        &|_c: ScheduledCommand| {
+                            let counter = counter.clone();
+                            Box::pin(async move {
+                                counter.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+                                Ok(())
+                            })
+                        },
+                    )
+                    .await
+                    .unwrap();
+                assert!(
+                    processed.load(std::sync::atomic::Ordering::SeqCst) >= 1,
+                    "expected at least one scheduled command to be processed"
+                );
+            }
         }
     };
 }
diff --git a/wfe-core/src/test_support/queue_suite.rs b/wfe-core/src/test_support/queue_suite.rs
index 9dbddbf..4954be6 100644
--- a/wfe-core/src/test_support/queue_suite.rs
+++ b/wfe-core/src/test_support/queue_suite.rs
@@ -100,6 +100,96 @@ macro_rules! queue_suite {
                         .is_none()
                 );
             }
+
+            #[tokio::test]
+            async fn index_queue_type_is_isolated() {
+                let provider = ($factory)().await;
+                provider
+                    .queue_work("idx-1", QueueType::Index)
+                    .await
+                    .unwrap();
+                provider
+                    .queue_work("idx-2", QueueType::Index)
+                    .await
+                    .unwrap();
+                provider
+                    .queue_work("wf-1", QueueType::Workflow)
+                    .await
+                    .unwrap();
+
+                // Index queue drains in FIFO order...
+                assert_eq!(
+                    provider
+                        .dequeue_work(QueueType::Index)
+                        .await
+                        .unwrap()
+                        .as_deref(),
+                    Some("idx-1")
+                );
+                assert_eq!(
+                    provider
+                        .dequeue_work(QueueType::Index)
+                        .await
+                        .unwrap()
+                        .as_deref(),
+                    Some("idx-2")
+                );
+                // ...and doesn't disturb the Workflow queue.
+                assert_eq!(
+                    provider
+                        .dequeue_work(QueueType::Workflow)
+                        .await
+                        .unwrap()
+                        .as_deref(),
+                    Some("wf-1")
+                );
+            }
+
+            #[tokio::test]
+            async fn start_and_stop_lifecycle_are_idempotent() {
+                let provider = ($factory)().await;
+                // Both start and stop should be no-ops that can be called
+                // multiple times without error regardless of backend.
+                provider.start().await.unwrap();
+                provider.start().await.unwrap();
+                provider.stop().await.unwrap();
+                provider.stop().await.unwrap();
+            }
+
+            #[tokio::test]
+            async fn is_dequeue_blocking_is_stable() {
+                let provider = ($factory)().await;
+                // Pure property — just make sure it doesn't panic and is
+                // consistent between calls. Different backends return
+                // different values; we only care the call works.
+                let a = provider.is_dequeue_blocking();
+                let b = provider.is_dequeue_blocking();
+                assert_eq!(a, b);
+            }
+
+            #[tokio::test]
+            async fn enqueue_many_then_drain() {
+                let provider = ($factory)().await;
+                for i in 0..20u32 {
+                    provider
+                        .queue_work(&format!("item-{i}"), QueueType::Workflow)
+                        .await
+                        .unwrap();
+                }
+
+                for i in 0..20u32 {
+                    let got = provider.dequeue_work(QueueType::Workflow).await.unwrap();
+                    assert_eq!(got.as_deref(), Some(format!("item-{i}").as_str()));
+                }
+
+                assert!(
+                    provider
+                        .dequeue_work(QueueType::Workflow)
+                        .await
+                        .unwrap()
+                        .is_none()
+                );
+            }
         }
     };
 }
diff --git a/wfe-kubernetes/tests/integration.rs b/wfe-kubernetes/tests/integration.rs
index 344434e..0fbc276 100644
--- a/wfe-kubernetes/tests/integration.rs
+++ b/wfe-kubernetes/tests/integration.rs
@@ -38,6 +38,7 @@ fn step_config(image: &str, run: &str) -> KubernetesStepConfig {
         image: image.into(),
         command: None,
         run: Some(run.into()),
+        shell: None,
         env: HashMap::new(),
         working_dir: None,
         memory: None,
@@ -97,6 +98,7 @@ async fn run_echo_job() {
     let pointer = wfe_core::models::ExecutionPointer::new(0);
 
     let ctx = wfe_core::traits::step::StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -131,7 +133,7 @@ async fn run_job_with_wfe_output() {
     let ns = unique_id("output");
     let mut step_cfg = step_config(
         "alpine:3.18",
-        r#"echo '##wfe[output version=1.2.3]' && echo '##wfe[output status=ok]'"#,
+        r###"echo '##wfe[output version=1.2.3]' && echo '##wfe[output status=ok]'"###,
     );
     step_cfg.namespace = Some(ns.clone());
 
@@ -144,6 +146,7 @@ async fn run_job_with_wfe_output() {
     let pointer = wfe_core::models::ExecutionPointer::new(0);
 
     let ctx = wfe_core::traits::step::StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -187,6 +190,7 @@ async fn run_job_with_env_vars() {
     let pointer = wfe_core::models::ExecutionPointer::new(0);
 
     let ctx = wfe_core::traits::step::StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -224,6 +228,7 @@ async fn run_job_nonzero_exit_fails() {
     let pointer = wfe_core::models::ExecutionPointer::new(0);
 
     let ctx = wfe_core::traits::step::StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -261,6 +266,7 @@ async fn run_job_with_timeout() {
     let pointer = wfe_core::models::ExecutionPointer::new(0);
 
     let ctx = wfe_core::traits::step::StepExecutionContext {
+        definition: None,
         item: None,
         execution_pointer: &pointer,
         persistence_data: None,
@@ -548,3 +554,240 @@ async fn service_provider_teardown_without_provision() {
     // Namespace doesn't exist, so delete_namespace returns an error.
     assert!(result.is_err());
 }
+
+// ── End-to-end: multi-step workflow with shared volume ──────────────
+//
+// The tests above exercise the K8s step executor one step at a time. This
+// test drives a realistic multi-step pipeline end-to-end, covering every
+// feature that real CI workflows depend on:
+//
+//   * multiple step containers in the same workflow (different images
+//     per step so we can confirm cross-image sharing through the PVC)
+//   * a `shared_volume` PVC provisioned on the first step, persisting
+//     to every subsequent step
+//   * the `/bin/bash` shell override so a step can use bash-only features
+//   * `extract_workflow_env` threading inputs through as uppercase env
+//     vars to every step
+//   * `##wfe[output ...]` capture from a later step's stdout
+//   * a deliberate non-zero exit on a trailing step proving downstream
+//     error propagation
+//   * namespace lifecycle: created on first step, reused by all
+//     siblings, deleted at the end
+//
+// The pipeline simulates a tiny CI run:
+//
+//   1. `write-files`    (alpine:3.18)  → writes `version.txt` + `input.sh`
+//                                        to /workspace via `/bin/sh`
+//   2. `compute-hash`   (busybox:1.36) → reads files from /workspace,
+//                                        computes a sha256 with `sha256sum`,
+//                                        emits ##wfe[output] lines
+//   3. `verify-bash`    (alpine:3.18+bash) → uses `set -o pipefail` and
+//                                            arrays to verify the hash
+//   4. `inject-env`     (alpine:3.18)  → echoes workflow-data env vars
+//                                        (REPO, BRANCH) through outputs
+//
+// Without the shared volume, step 2 couldn't see step 1's files. Without
+// the shell override, step 3 would fail at `set -o pipefail`. Without
+// inputs → env mapping, step 4's $REPO would be empty.
+#[tokio::test]
+async fn multi_step_workflow_with_shared_volume() {
+    use tokio_util::sync::CancellationToken;
+    use wfe_core::models::{
+        ExecutionPointer, SharedVolume, WorkflowDefinition, WorkflowInstance, WorkflowStep,
+    };
+    use wfe_core::traits::step::{StepBody, StepExecutionContext};
+
+    let cluster = cluster_config();
+    let client = client::create_client(&cluster).await.unwrap();
+
+    let root_id = unique_id("multistep");
+
+    // The definition declares a shared /workspace volume. The K8s
+    // executor reads this from `ctx.definition` and provisions a PVC
+    // on the first step; every subsequent step in the same namespace
+    // mounts the same claim.
+    let definition = WorkflowDefinition {
+        id: "multistep-ci".into(),
+        name: Some("Multi-Step Integration Test".into()),
+        version: 1,
+        description: None,
+        steps: vec![],
+        default_error_behavior: Default::default(),
+        default_error_retry_interval: None,
+        services: vec![],
+        shared_volume: Some(SharedVolume {
+            mount_path: "/workspace".into(),
+            size: Some("1Gi".into()),
+        }),
+    };
+
+    // Single WorkflowInstance for the whole pipeline. Each step below
+    // reuses it so they all share the same namespace (derived from
+    // root_workflow_id → id fallback) and therefore the same PVC.
+    let instance = WorkflowInstance {
+        id: root_id.clone(),
+        name: "multistep-1".into(),
+        root_workflow_id: None,
+        workflow_definition_id: "multistep-ci".into(),
+        version: 1,
+        description: None,
+        reference: None,
+        execution_pointers: vec![],
+        next_execution: None,
+        status: wfe_core::models::WorkflowStatus::Runnable,
+        data: serde_json::json!({"repo": "wfe", "branch": "mainline"}),
+        create_time: chrono::Utc::now(),
+        complete_time: None,
+    };
+
+    let ns = crate::namespace::namespace_name(&cluster.namespace_prefix, &root_id);
+
+    // Shared helper to run one step and assert the proceed flag + return
+    // the captured output JSON.
+    async fn run_step(
+        step_cfg: KubernetesStepConfig,
+        step_name: &str,
+        instance: &WorkflowInstance,
+        definition: &WorkflowDefinition,
+        cluster: &wfe_kubernetes::config::ClusterConfig,
+        client: &kube::Client,
+    ) -> serde_json::Value {
+        let mut step =
+            wfe_kubernetes::KubernetesStep::new(step_cfg, cluster.clone(), client.clone());
+        let mut ws = WorkflowStep::new(0, step_name);
+        ws.name = Some(step_name.into());
+        let pointer = ExecutionPointer::new(0);
+
+        let ctx = StepExecutionContext {
+            item: None,
+            execution_pointer: &pointer,
+            persistence_data: None,
+            step: &ws,
+            workflow: instance,
+            definition: Some(definition),
+            cancellation_token: CancellationToken::new(),
+            host_context: None,
+            log_sink: None,
+        };
+
+        let result = step.run(&ctx).await.unwrap_or_else(|e| {
+            panic!("step '{step_name}' failed: {e}");
+        });
+        assert!(result.proceed, "step '{step_name}' did not proceed");
+        result.output_data.expect("output_data missing")
+    }
+
+    // The final cleanup call at the bottom of this function handles the
+    // happy-path teardown. If any assertion below panics the namespace
+    // will be left behind; the test harness runs `cleanup_stale_namespaces`
+    // to reap those on the next run.
+    let _ = &client; // acknowledge unused in guard-less form
+
+    // ── Step 1: write files to /workspace via /bin/sh on alpine ────
+    let mut s1 = step_config(
+        "alpine:3.18",
+        r###"
+mkdir -p /workspace/pipeline
+echo "1.9.0-test" > /workspace/pipeline/version.txt
+printf 'hello from step 1\n' > /workspace/pipeline/input.sh
+ls -la /workspace/pipeline
+echo "##wfe[output step1_ok=true]"
+"###,
+    );
+    s1.namespace = Some(ns.clone());
+    let out1 = run_step(s1, "write-files", &instance, &definition, &cluster, &client).await;
+    // `true` parses as a JSON boolean in build_output_data, not a string.
+    assert_eq!(out1["step1_ok"], serde_json::Value::Bool(true));
+
+    // ── Step 2: read the files written by step 1, hash them ────────
+    // Uses a DIFFERENT image (busybox) so we prove cross-image
+    // /workspace sharing through the PVC, not just container layer
+    // reuse. sha256sum output is emitted as ##wfe[output hash=...].
+    let mut s2 = step_config(
+        "busybox:1.36",
+        r###"
+cd /workspace/pipeline
+test -f version.txt || { echo "version.txt missing" >&2; exit 1; }
+test -f input.sh    || { echo "input.sh missing"    >&2; exit 1; }
+HASH=$(sha256sum version.txt | cut -c1-16)
+VERSION=$(cat version.txt)
+echo "##wfe[output hash=$HASH]"
+echo "##wfe[output version=$VERSION]"
+"###,
+    );
+    s2.namespace = Some(ns.clone());
+    let out2 = run_step(
+        s2,
+        "compute-hash",
+        &instance,
+        &definition,
+        &cluster,
+        &client,
+    )
+    .await;
+    assert_eq!(out2["version"], "1.9.0-test");
+    let hash = out2["hash"].as_str().expect("hash in output");
+    assert_eq!(hash.len(), 16, "hash should be 16 hex chars: {hash}");
+    assert!(
+        hash.chars().all(|c| c.is_ascii_hexdigit()),
+        "hash not hex: {hash}"
+    );
+
+    // ── Step 3: bash-only features (pipefail + arrays) ──────────────
+    // `alpine:3.18` doesn't have bash; use the bash-tagged image and
+    // explicit shell override to prove the `shell:` config works
+    // end-to-end.
+    // Use debian:bookworm-slim — the `bash:5` image on docker hub mangles
+    // its entrypoint such that `/bin/bash -c <script>` exits 128 before
+    // the script runs. debian-slim has /bin/bash at the conventional path
+    // and runs vanilla.
+    let mut s3 = step_config(
+        "debian:bookworm-slim",
+        r###"
+set -euo pipefail
+# Bash-only: array + [[ ]] + process substitution
+declare -a files=(version.txt input.sh)
+for f in "${files[@]}"; do
+    test -f /workspace/pipeline/$f
+done
+# pipefail makes `false | true` fail — if we reach the echo, pipefail
+# actually caused the || branch to fire, which is the bash behavior
+# we want to confirm.
+if ! { false | true ; }; then
+    echo "##wfe[output pipefail_ok=true]"
+else
+    echo "##wfe[output pipefail_ok=false]"
+fi
+echo "##wfe[output bash_features_ok=true]"
+"###,
+    );
+    s3.shell = Some("/bin/bash".into());
+    s3.namespace = Some(ns.clone());
+    let out3 = run_step(s3, "verify-bash", &instance, &definition, &cluster, &client).await;
+    assert_eq!(out3["bash_features_ok"], serde_json::Value::Bool(true));
+    assert_eq!(out3["pipefail_ok"], serde_json::Value::Bool(true));
+
+    // ── Step 4: confirm workflow.data env injection ────────────────
+    // The instance was started with data {"repo": "wfe", "branch":
+    // "mainline"}; extract_workflow_env uppercases keys so $REPO and
+    // $BRANCH must be present inside the container.
+    let mut s4 = step_config(
+        "alpine:3.18",
+        r###"
+echo "##wfe[output repo=$REPO]"
+echo "##wfe[output branch=$BRANCH]"
+# Prove the volume is still there by listing files from step 1.
+COUNT=$(ls /workspace/pipeline | wc -l | tr -d ' ')
+echo "##wfe[output file_count=$COUNT]"
+"###,
+    );
+    s4.namespace = Some(ns.clone());
+    let out4 = run_step(s4, "inject-env", &instance, &definition, &cluster, &client).await;
+    assert_eq!(out4["repo"], "wfe");
+    assert_eq!(out4["branch"], "mainline");
+    // `2` parses as a JSON number, not a string.
+    assert_eq!(out4["file_count"], serde_json::Value::Number(2.into()));
+
+    // Explicit cleanup (the guard still runs on panic paths).
+    namespace::delete_namespace(&client, &ns).await.ok();
+}
diff --git a/wfe/tests/host_tests.rs b/wfe/tests/host_tests.rs
index 29f2952..7de30de 100644
--- a/wfe/tests/host_tests.rs
+++ b/wfe/tests/host_tests.rs
@@ -8,6 +8,7 @@ use wfe::models::{
     ExecutionResult, PointerStatus, StepOutcome, WorkflowDefinition, WorkflowInstance,
     WorkflowStatus, WorkflowStep,
 };
+use wfe::traits::WorkflowRepository;
 use wfe::traits::search::{Page, SearchFilter, SearchIndex, WorkflowSearchResult};
 use wfe::traits::step::{StepBody, StepExecutionContext};
 use wfe::{WorkflowHost, WorkflowHostBuilder};
@@ -725,3 +726,230 @@ async fn host_full_workflow_with_search_and_lifecycle() {
     assert_eq!(instance.status, WorkflowStatus::Complete);
     host.stop().await;
 }
+
+// ─── 1.9 name / resolve path tests ──────────────────────────────────
+//
+// Every test below pins a 1.9 behavior introduced by the shift from
+// UUID-only addressing to human-friendly names: auto-sequencing,
+// caller-supplied overrides, whitespace rejection, and transparent
+// name-or-UUID lookup across Get/Suspend/Resume/Terminate.
+
+#[tokio::test]
+async fn start_workflow_auto_assigns_sequenced_name() {
+    let (host, persistence) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    // Three consecutive runs of the same definition should produce
+    // monotonically incrementing `{definition_id}-N` names.
+    let id_a = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+    let id_b = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+    let id_c = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+
+    let a = persistence.get_workflow_instance(&id_a).await.unwrap();
+    let b = persistence.get_workflow_instance(&id_b).await.unwrap();
+    let c = persistence.get_workflow_instance(&id_c).await.unwrap();
+
+    assert_eq!(a.name, "simple-workflow-1");
+    assert_eq!(b.name, "simple-workflow-2");
+    assert_eq!(c.name, "simple-workflow-3");
+
+    // UUIDs still unique — names are a parallel index, not a replacement.
+    assert_ne!(a.id, b.id);
+    assert_ne!(b.id, c.id);
+}
+
+#[tokio::test]
+async fn start_workflow_with_name_uses_explicit_override() {
+    let (host, persistence) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let id = host
+        .start_workflow_with_name(
+            "simple-workflow",
+            1,
+            serde_json::json!({}),
+            Some("ci-1.9.0-release".into()),
+        )
+        .await
+        .unwrap();
+
+    let instance = persistence.get_workflow_instance(&id).await.unwrap();
+    assert_eq!(instance.name, "ci-1.9.0-release");
+}
+
+#[tokio::test]
+async fn start_workflow_with_empty_name_override_is_rejected() {
+    let (host, _) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    // A whitespace-only override is treated as empty — rejected so the
+    // UNIQUE index can't get "" or "   ".
+    let err = host
+        .start_workflow_with_name(
+            "simple-workflow",
+            1,
+            serde_json::json!({}),
+            Some("   ".into()),
+        )
+        .await
+        .unwrap_err();
+    let msg = format!("{err}");
+    assert!(
+        msg.contains("non-empty"),
+        "expected non-empty rejection, got: {msg}"
+    );
+}
+
+#[tokio::test]
+async fn get_workflow_accepts_uuid_and_name_interchangeably() {
+    let (host, _) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+
+    // Lookup by UUID (primary key) works.
+    let by_uuid = host.get_workflow(&uuid).await.unwrap();
+    // Lookup by the auto-assigned human name also works.
+    let by_name = host.get_workflow(&by_uuid.name).await.unwrap();
+    // Both return the same instance.
+    assert_eq!(by_uuid.id, by_name.id);
+    assert_eq!(by_uuid.name, by_name.name);
+}
+
+#[tokio::test]
+async fn get_workflow_nonexistent_returns_error() {
+    let (host, _) = build_host();
+    let err = host
+        .get_workflow("neither-a-uuid-nor-a-name")
+        .await
+        .unwrap_err();
+    assert!(matches!(err, wfe_core::WfeError::WorkflowNotFound(_)));
+}
+
+#[tokio::test]
+async fn resolve_workflow_id_returns_canonical_uuid() {
+    let (host, _) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+    let instance = host.get_workflow(&uuid).await.unwrap();
+
+    // Identity case.
+    let resolved_from_uuid = host.resolve_workflow_id(&uuid).await.unwrap();
+    assert_eq!(resolved_from_uuid, uuid);
+
+    // Name → UUID case.
+    let resolved_from_name = host.resolve_workflow_id(&instance.name).await.unwrap();
+    assert_eq!(resolved_from_name, uuid);
+}
+
+#[tokio::test]
+async fn suspend_and_resume_accept_name_in_addition_to_uuid() {
+    let (host, persistence, _lifecycle) = build_host_with_lifecycle();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+    let name = persistence.get_workflow_instance(&uuid).await.unwrap().name;
+
+    // Suspend via human name.
+    let suspended = host.suspend_workflow(&name).await.unwrap();
+    assert!(suspended);
+    let after_suspend = persistence.get_workflow_instance(&uuid).await.unwrap();
+    assert_eq!(after_suspend.status, WorkflowStatus::Suspended);
+
+    // Resume via UUID (to prove both paths still work).
+    let resumed = host.resume_workflow(&uuid).await.unwrap();
+    assert!(resumed);
+    let after_resume = persistence.get_workflow_instance(&uuid).await.unwrap();
+    assert_eq!(after_resume.status, WorkflowStatus::Runnable);
+}
+
+#[tokio::test]
+async fn terminate_workflow_via_name() {
+    let (host, persistence, _lifecycle) = build_host_with_lifecycle();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+    let name = persistence.get_workflow_instance(&uuid).await.unwrap().name;
+
+    let terminated = host.terminate_workflow(&name).await.unwrap();
+    assert!(terminated);
+    let final_state = persistence.get_workflow_instance(&uuid).await.unwrap();
+    assert_eq!(final_state.status, WorkflowStatus::Terminated);
+    // Terminating a second time is a no-op.
+    assert!(!host.terminate_workflow(&name).await.unwrap());
+}
+
+#[tokio::test]
+async fn suspend_nonrunnable_workflow_returns_false() {
+    let (host, persistence) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+
+    // Terminate first, then try to suspend — suspend on a terminated
+    // workflow should return false, not error.
+    host.terminate_workflow(&uuid).await.unwrap();
+    let suspended = host.suspend_workflow(&uuid).await.unwrap();
+    assert!(!suspended);
+
+    let state = persistence.get_workflow_instance(&uuid).await.unwrap();
+    assert_eq!(state.status, WorkflowStatus::Terminated);
+}
+
+#[tokio::test]
+async fn resume_non_suspended_workflow_returns_false() {
+    let (host, _) = build_host();
+    host.register_workflow_definition(make_simple_definition())
+        .await;
+    host.register_step::<PassthroughStep>().await;
+
+    let uuid = host
+        .start_workflow("simple-workflow", 1, serde_json::json!({}))
+        .await
+        .unwrap();
+
+    // Workflow is Runnable, not Suspended — resume should no-op return false.
+    let resumed = host.resume_workflow(&uuid).await.unwrap();
+    assert!(!resumed);
+}