diff --git a/crates/lumio-codec/src/resource.rs b/crates/lumio-codec/src/resource.rs
index bbb9724..9c99f9e 100644
--- a/crates/lumio-codec/src/resource.rs
+++ b/crates/lumio-codec/src/resource.rs
@@ -11,6 +11,12 @@ pub struct CodecWorkspace {
     scratch: Mutex<Vec<u8>>,
 }
 
+impl Default for CodecWorkspace {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CodecWorkspace {
     pub fn new() -> Self {
         Self {
@@ -41,6 +47,12 @@ pub struct CodecResource {
     destroyed: AtomicBool,
 }
 
+impl Default for CodecResource {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CodecResource {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-job/src/cancel.rs b/crates/lumio-job/src/cancel.rs
index 55dd99e..1fa58bb 100644
--- a/crates/lumio-job/src/cancel.rs
+++ b/crates/lumio-job/src/cancel.rs
@@ -16,6 +16,12 @@ pub struct CancellationView {
     flag: Arc<AtomicBool>,
 }
 
+impl Default for CancellationSource {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CancellationSource {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-job/src/operation.rs b/crates/lumio-job/src/operation.rs
index 9a942c2..c703cca 100644
--- a/crates/lumio-job/src/operation.rs
+++ b/crates/lumio-job/src/operation.rs
@@ -17,6 +17,12 @@ pub struct OperationRegistry {
     kernels: HashMap<OperationId, Arc<dyn TypedKernel>>,
 }
 
+impl Default for OperationRegistry {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl OperationRegistry {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-kernel/src/context/registry.rs b/crates/lumio-kernel/src/context/registry.rs
index e63d16a..c49363a 100644
--- a/crates/lumio-kernel/src/context/registry.rs
+++ b/crates/lumio-kernel/src/context/registry.rs
@@ -15,6 +15,12 @@ pub struct ResourceRegistry {
     items: Mutex<Vec<Arc<dyn ContextResource>>>,
 }
 
+impl Default for ResourceRegistry {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ResourceRegistry {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-platform/Cargo.toml b/crates/lumio-platform/Cargo.toml
index 0742fd2..e7bd235 100644
--- a/crates/lumio-platform/Cargo.toml
+++ b/crates/lumio-platform/Cargo.toml
@@ -3,5 +3,10 @@ name = "lumio-platform"
 version.workspace = true
 edition.workspace = true
 publish.workspace = true
+# `benches/clock.rs` is compiled as a `cfg(test)` module via `#[path]` from `lib.rs`
+# (criterion is not approved; EXTERNAL_ALLOWLIST is empty). Cargo's bench
+# auto-discovery would additionally register it as a bench target, where its
+# `use crate::{..}` does not resolve (E0432) and `--all-targets` fails.
+autobenches = false
 
 [dependencies]
diff --git a/crates/lumio-platform/src/clock.rs b/crates/lumio-platform/src/clock.rs
index a95c60f..2184642 100644
--- a/crates/lumio-platform/src/clock.rs
+++ b/crates/lumio-platform/src/clock.rs
@@ -65,6 +65,12 @@ pub struct StdMonotonicClock {
     epoch: Instant,
 }
 
+impl Default for StdMonotonicClock {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl StdMonotonicClock {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-spatial/src/index/grid_reference.rs b/crates/lumio-spatial/src/index/grid_reference.rs
index 1446589..b5cd3dc 100644
--- a/crates/lumio-spatial/src/index/grid_reference.rs
+++ b/crates/lumio-spatial/src/index/grid_reference.rs
@@ -14,6 +14,12 @@ pub struct GridReferenceIndex {
     objects: BTreeMap<SpatialObjectId, Aabb3>,
 }
 
+impl Default for GridReferenceIndex {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl GridReferenceIndex {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-spatial/src/index/rstar_adapter.rs b/crates/lumio-spatial/src/index/rstar_adapter.rs
index 846329e..76433dc 100644
--- a/crates/lumio-spatial/src/index/rstar_adapter.rs
+++ b/crates/lumio-spatial/src/index/rstar_adapter.rs
@@ -18,6 +18,12 @@ pub struct RStarIndexAdapter {
     inner: GridReferenceIndex,
 }
 
+impl Default for RStarIndexAdapter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RStarIndexAdapter {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-spatial/src/query.rs b/crates/lumio-spatial/src/query.rs
index c6c7d94..d34e066 100644
--- a/crates/lumio-spatial/src/query.rs
+++ b/crates/lumio-spatial/src/query.rs
@@ -23,6 +23,12 @@ pub struct SpatialContext {
     index: GridReferenceIndex,
 }
 
+impl Default for SpatialContext {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SpatialContext {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-spatial/src/resource.rs b/crates/lumio-spatial/src/resource.rs
index d5536ef..c1c7b66 100644
--- a/crates/lumio-spatial/src/resource.rs
+++ b/crates/lumio-spatial/src/resource.rs
@@ -14,6 +14,12 @@ pub struct SpatialResource {
     destroyed: AtomicBool,
 }
 
+impl Default for SpatialResource {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SpatialResource {
     pub fn new() -> Self {
         Self {
diff --git a/crates/lumio-test-support/src/fixtures.rs b/crates/lumio-test-support/src/fixtures.rs
index d4b9517..7b7dd0b 100644
--- a/crates/lumio-test-support/src/fixtures.rs
+++ b/crates/lumio-test-support/src/fixtures.rs
@@ -9,6 +9,12 @@ pub struct FixtureLoader {
     _private: (),
 }
 
+impl Default for FixtureLoader {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl FixtureLoader {
     pub fn new() -> Self {
         Self { _private: () }
@@ -29,6 +35,12 @@ pub struct FaultPlan {
     _private: (),
 }
 
+impl Default for FaultPlan {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl FaultPlan {
     pub fn new() -> Self {
         Self { _private: () }
@@ -40,6 +52,12 @@ pub struct PanicProbe {
     _private: (),
 }
 
+impl Default for PanicProbe {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl PanicProbe {
     pub fn new() -> Self {
         Self { _private: () }
diff --git a/xtask/src/baseline.rs b/xtask/src/baseline.rs
index cbb6fb0..3776209 100644
--- a/xtask/src/baseline.rs
+++ b/xtask/src/baseline.rs
@@ -41,12 +41,12 @@ fn must_not_contain(errors: &mut Vec<String>, rel: &str, body: &str, needle: &st
 
 /// SHA-256 hex of `path` via `sha256sum` (CI) or `certutil` (Windows).
 pub fn file_sha256_hex(path: &Path) -> Result<String, String> {
-    if let Ok(out) = Command::new("sha256sum").arg(path).output() {
-        if out.status.success() {
-            let text = String::from_utf8_lossy(&out.stdout);
-            if let Some(hex) = text.split_whitespace().next() {
-                return Ok(hex.to_ascii_lowercase());
-            }
+    if let Ok(out) = Command::new("sha256sum").arg(path).output()
+        && out.status.success()
+    {
+        let text = String::from_utf8_lossy(&out.stdout);
+        if let Some(hex) = text.split_whitespace().next() {
+            return Ok(hex.to_ascii_lowercase());
         }
     }
     let out = Command::new("certutil")