TypeScript imports naming the emitted .js extension never resolve through the import resolver (wrapper methods become self-edges) #1705

Summary

A TypeScript relative import that names the emitted extension (import { x } from './util.js' for util.ts, the form moduleResolution: node16 | nodenext | bundler requires) never resolves through the import resolver. resolveRelativeImport appends each candidate extension to the specifier (util.js.ts, util.js.tsx, …) and then tries the specifier as-is (util.js), and none of those files exist, so it returns null. Every name imported that way then falls through to bare-name matching.

Two visible effects on a real repo (Chrome MV3 extension, 582 files, 92 of its .ts files import with .js specifiers):

1. A method that wraps the same-named function it imports resolves to itself. renderDockStyles() { return renderDockStyles(); } in a class, with renderDockStyles imported from ./template.js, gets a calls edge from the method to the method (resolvedBy: exact-match, confidence 0.4). Eight such false self-edges here: three dock-template wrappers, four static wrappers on a consensus engine, one ...args pass-through. This is the shape TypeScript: a call through this.<field> resolves to the ENCLOSING method when the two share a name — silent self-edge, 0% recall on that shape #1496 does not cover (that one is this.field.method()).
2. Cross-module edges are name guesses. On this tree 4,002 calls/imports edges were resolvedBy: import and 15,419 exact-match; with the remap below it is 7,312 and 12,784. fuzzy drops 44 → 23.

Repro

// template.ts
export function renderDockStyles(): string { return ".dock {}"; }

// sidebar.ts
import { renderDockStyles } from "./template.js";
export class Sidebar {
  renderDockStyles(): string { return renderDockStyles(); }
}

codegraph init on those two files: the calls edge from Sidebar::renderDockStyles targets Sidebar::renderDockStyles, not template.ts::renderDockStyles. Same for .jsx → .tsx, .mjs → .mts, .cjs → .cts, and for an aliased specifier (@/lib/util.js).

Fix

When the specifier ends in an emitted extension and no file with that exact name exists, retry with the source extensions TypeScript would have compiled from (.js → .ts, .tsx, .d.ts; .jsx → .tsx; .mjs → .mts; .cjs → .cts), for the TS/JS-family languages only. A real .js file still wins when both exist. PR incoming.