feat: Add attention pipeline, query engine, runtime, layers, benchmarks, and embedding search

- Add four-level attention pipeline (view/temporal/semantic/write) per ADR-021
- Add query-first rendering engine with SceneQuery/QueryResult per ADR-022
- Add three-cadence loop scheduler (fast 60Hz, medium 5Hz, slow 0.5Hz) per ADR-019
- Add static/dynamic layer separation with automatic Gaussian classification
- Add cosine-similarity embedding search (search_by_embedding, top_k_by_embedding) to EntityGraph
- Add Criterion benchmark suite (20 benchmarks across 8 groups: gaussian, tile, draw_list, coherence, entity, mask, streaming, sort)
- Add performance acceptance tests
- Implement WASM integration path in viewer (coherence gate, entity graph, active mask, draw list)
- 177 tests passing, clippy clean, zero dependencies in core crate

https://claude.ai/code/session_012MQauGiqSnQbszfmFKpsNT

Author: claude

Cargo.lock

@@ -329,6 +329,12 @@ pub struct WasmCoherenceGate {
     inner: CoherenceGate,
 }
 
+impl Default for WasmCoherenceGate {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[wasm_bindgen]
 impl WasmCoherenceGate {
     /// Create a gate with the default policy.
@@ -403,6 +409,12 @@ pub struct WasmEntityGraph {
     inner: EntityGraph,
 }
 
+impl Default for WasmEntityGraph {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[wasm_bindgen]
 impl WasmEntityGraph {
     /// Create an empty entity graph.
@@ -607,6 +619,12 @@ pub struct WasmLineageLog {
     inner: LineageLog,
 }
 
+impl Default for WasmLineageLog {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[wasm_bindgen]
 impl WasmLineageLog {
     /// Create an empty lineage log.
@@ -680,16 +698,22 @@ impl WasmLineageLog {
     pub fn len(&self) -> usize {
         self.inner.len()
     }
+
+    /// Check if the log is empty.
+    #[wasm_bindgen(js_name = isEmpty)]
+    pub fn is_empty(&self) -> bool {
+        self.inner.is_empty()
+    }
 }
 
 fn make_provenance(source_type: &str, confidence: f32) -> Provenance {
-    let source = if source_type.starts_with("sensor:") {
+    let source = if let Some(stripped) = source_type.strip_prefix("sensor:") {
         ProvenanceSource::Sensor {
-            sensor_id: source_type[7..].to_string(),
+            sensor_id: stripped.to_string(),
         }
-    } else if source_type.starts_with("model:") {
+    } else if let Some(stripped) = source_type.strip_prefix("model:") {
         ProvenanceSource::Inference {
-            model_id: source_type[6..].to_string(),
+            model_id: stripped.to_string(),
         }
     } else if source_type == "manual" {
         ProvenanceSource::Manual {

crates/ruvector-vwm-wasm/src/lib.rs

@@ -13,5 +13,12 @@ default = []
 simd = []
 ffi = []
 
+[dev-dependencies]
+criterion = { workspace = true }
+
 [lib]
 crate-type = ["lib"]
+
+[[bench]]
+name = "vwm_bench"
+harness = false