feat: HNSW index, consolidation engine, Kotlin/TS/Go bindings, SQLite migration connector

- vector.rs: replace flat O(n) scan with instant-distance HNSW for stores
  >= 100 nodes; flat scan retained as fallback for small graphs; dirty-flag
  persistence in sled triggers index rebuild only when nodes are added

- consolidation.rs: Episodic → Semantic promotion based on activation_count
  and salience_floor thresholds; global decay pass after each cycle;
  ConsolidationConfig + ConsolidationReport types; 8 tests

- migration.rs: reads Neuron SQLite (memory_nodes, knowledge_entries,
  graph_edges) and writes to Engram sled; placeholder unit-vector embeddings
  with TODO for ONNX; 5 tests including full in-memory DB roundtrip

- crates/engram-migrate: CLI binary (engram-migrate --sqlite / --output)

- crates/engram-jni: JNI cdylib exposing open/close/put_node/get_node/
  activate/search_embedding/touch/decay/node_count/edge_count via
  Java_ai_neuron_engram_EngramDb_* entry points; 6 tests

- bindings/kotlin: EngramDb.kt (AutoCloseable JNI wrapper), EngramNode,
  EngramEdge, ActivatedNode, EngramTypes; build.gradle.kts; settings.gradle.kts

- bindings/typescript: engram-wasm crate (wasm-bindgen, serde-wasm-bindgen);
  WasmEngramDb with in-memory backend (sled not available in WASM);
  TypeScript wrapper (index.ts, types.ts, package.json, tsconfig.json)

- bindings/go: engram.go (CGo wrapper), engram.h (C header), engram_test.go
  (4 tests covering open/close/put_node/get_node/node_count/decay); go.mod

- engram-core: wasm feature gate for in-memory backend; mem_storage.rs;
  activation.activate_mem for WASM path; Node::with_id helper;
  salience.rs doctest fixed (text block)

- examples/basic.rs: consolidation section added
- examples/migrate.rs: migration API demonstration

Build: cargo build --workspace -- zero warnings, zero errors
Tests: 38 pass (25 engram-core + 7 engram-ffi + 6 engram-jni)

engram/crates/engram-core/src/lib.rs

@@ -30,13 +30,19 @@
 /// }
 /// ```
 pub mod activation;
+pub mod consolidation;
 pub mod db;
 pub mod error;
 pub mod graph;
 pub mod salience;
+#[cfg(not(feature = "wasm"))]
 pub mod storage;
+#[cfg(feature = "wasm")]
+pub mod mem_storage;
 pub mod types;
 pub mod vector;
+#[cfg(feature = "migration")]
+pub mod migration;
 
 // Re-export the public surface
 pub use db::EngramDb;
@@ -44,3 +50,4 @@ pub use error::{EngramError, EngramResult};
 pub use types::{
     ActivatedNode, Edge, MemoryTier, Node, NodeType, RelationType, ScoredNode, now_ms,
 };
+pub use consolidation::{ConsolidationConfig, ConsolidationReport};