init: Engram v0.1 — native memory substrate for accumulating intelligence

Memory is not stored and retrieved — it is activated and propagated. Implements the spreading activation model with salience decay, typed edges, four memory tiers, and flat cosine vector search over a sled embedded store.
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+# TypeScript Bindings (planned v0.2)
+
+Two paths for TypeScript/Node.js:
+
+## Option A — WASM (browser + Node)
+
+```
+cargo build --target wasm32-unknown-unknown --release -p engram-core
+wasm-bindgen target/wasm32-unknown-unknown/release/engram_core.wasm --out-dir pkg/
+```
+
+Requires `wasm-bindgen` annotations on public API. Browser-compatible, no native deps.
+
+## Option B — Node native addon (server-side)
+
+Use `napi-rs` to generate a Node.js native addon from `engram-core`. Faster than WASM for
+server-side agents, but requires a native build step per platform.
+
+## Status
+
+Stub only. WASM target is the preferred path for v0.2 given the local-first, embedded philosophy.