The #1462 same-label cross-file stub disambiguation (the origin_file key) only
existed in the generic extractor, so the six dedicated extractors — Julia,
Fortran, Go, Rust, PowerShell, ObjC — still collapsed same-named imported-type
stubs from different files into one conflated bare-id node (a false cross-package
link). Each now sets origin_file on its sourceless stub, identical to the generic
extractor; the generic _node_disambiguation_source_key consumes it, so two files
importing the same type stay distinct while source_file stays empty (the #1402
rewire onto a real definition is unchanged).
Ported from PR #1515 by @TPAteeq. Must ship with #1516: this widens origin_file to
six more languages, and #1516 is what strips it from graph.json. Verified: a 2-file
Go corpus now yields 2 distinct Widget stubs AND graph.json carries no origin_file.
Resolved a test-insertion conflict with #1516 by keeping both tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
