Problem

The native engine (Rust/napi-rs) does not extract prototype-based method definitions like:

Dog.prototype.bark = function() { ... };

Running codegraph build on such a file extracts Dog, Animal, etc. but NOT Dog.bark as a method node.

The WASM engine correctly extracts this via extractPrototypeMethodsWalk in src/extractors/javascript.ts.

Impact

The integration test in tests/integration/prototype-method-resolution.test.ts (added in #1317 work) fails when the native engine is active because:

1. Dog.bark node does not exist in the DB
2. d.bark() call edge cannot resolve to a non-existent node
3. (new Dog('Rex')).bark() inline-new receiver call also fails

The test was pinned to WASM engine in branch fix/wasm-prototype-method-test-1381 (PR #1400) but that change was not yet merged to main.

Expected behavior

Both engines should produce identical results (as stated in CLAUDE.md: "Both engines must produce identical results").

Affected files

• crates/codegraph-core/src/ — native extractor needs prototype assignment extraction
• tests/integration/prototype-method-resolution.test.ts — test should either be pinned to WASM or the native engine fixed