The variable / method-definition extractors never walked top-level
initializer values or inline-object method bodies, so calls like
`const token = getTokenMp()` and `methods: { save() { getTokenMp() } }`
showed up nowhere in `codegraph_callers`. The variable extractor now
walks any non-object initializer value; the method-definition extractor
still skips synthetic nodes for inline-object methods (noise rationale
unchanged) but now walks their bodies for calls. Surfaces in plain
`.ts`/`.js` files as well as Vue SFCs (`<script setup>` initializers +
Options API `methods: {...}` / `setup()`), which is where the bug was
originally reported.
Closes#425.