CommonJS exports.X = async () => {} route handlers aren't indexed as symbols

[azorlu80]

Version: v1.6.0

Handlers written as exports.foo = () => {} / exports.foo = async () => {} (a very common Express/CommonJS controller style) don't seem to be indexed as function nodes. node/callers can't find them, and calls into them collapse to file level (the calling function is lost).

Repro:

1. controller.js:

   exports.getItems = async (req, res) => { /* ... */ };

   wired in a router: router.get('/items', getItems)
2. codegraph node getItems → "Symbol not found", although it's a real, route-wired handler.

Impact: in one real Express codebase, 60+ route handlers written in this style are invisible to the graph, so impact/callers analysis silently misses them.

Ask: index the exports.<name> = (arrow | async arrow | function) assignment form as a function node — the same treatment const X = () => {} already gets.

[danusha2345]

Reproduced on 1.6.0 and fixed in #1678: exports.NAME = <arrow|function> and module.exports.NAME = … are extracted as exported function nodes (both the wasm walker and the kernel), so node getItems / callers find the handler and its calls belong to it rather than the file. Other member assignments (handlers.onSave = () => {}) are untouched.