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/Cargo.toml

@@ -3,6 +3,10 @@ resolver = "2"
 members = [
     "crates/engram-core",
     "crates/engram-ffi",
+    "crates/engram-jni",
+    "crates/engram-migrate",
+    # engram-wasm is in bindings/ and compiled separately via wasm-pack
+    # (wasm targets can't be in the same workspace build as native targets)
 ]
 
 # Workspace-level example that depends on engram-core.
@@ -11,10 +15,17 @@ members = [
 name = "basic"
 path = "examples/basic.rs"
 
+[[example]]
+name = "migrate"
+path = "examples/migrate.rs"
+
 [package]
 name = "engram"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
+[features]
+migration = ["engram-core/migration"]
+
 [dependencies]
 engram-core = { path = "crates/engram-core" }