fix(node): commit generated loader so the npm package is usable

The published main package shipped without index.js/index.d.ts: they were gitignored and the publish job never re-runs `napi build`, so the package had no entrypoint and could not be imported. Commit the generated JS interface (regenerated for the scoped @nodedb-lab/code2graph name) and ignore only the per-platform *.node binaries. Verified: the package loads via the published platform binary and resolves a cross-file call edge.

Author: farhan-syah

bindings/node/.gitignore

@@ -1,8 +1,10 @@
 /target
 node_modules/
 *.node
-index.js
-index.d.ts
+# index.js + index.d.ts are the generated JS interface — they are COMMITTED
+# (regenerate with `npm run build` when the #[napi] API changes) so the
+# published main package ships its loader. Only the per-platform *.node binaries
+# are build artifacts.
 npm-debug.log*
 # napi-rs release scaffolding (generated by create-npm-dirs / artifacts)
 npm/

bindings/node/index.d.ts

@@ -0,0 +1,24 @@
+/* auto-generated by NAPI-RS */
+/* eslint-disable */
+/**
+ * Resolve extracted facts into a code graph.
+ *
+ * `files` is a JS array of objects as returned by [`extract`]. `tier` selects
+ * the resolver: `"name"` (default) uses Tier A (`NameOnly`); `"scope"` uses
+ * Tier B (`Scoped`/`Exact`). Returns a JS object mirroring `CodeGraph`.
+ */
+export declare function buildGraph(files: any, tier?: string | undefined | null): any
+
+/**
+ * Extract symbols and references from a single source file.
+ *
+ * `file` is a project-relative path used to infer the language; `source` is
+ * its contents. Returns a JS object mirroring `FileFacts`.
+ */
+export declare function extract(file: string, source: string): any
+
+/**
+ * Return the canonical language tag for a file path, or `null` if the
+ * extension is not recognized (e.g. `"src/main.rs"` -> `"rust"`).
+ */
+export declare function languageOf(path: string): string | null