extract_bash only linked calls whose callee was defined in the same file, so a
call to a function from a `source`d library was silently dropped and shell
scripts looked disconnected from the libraries they use. The resolver for exactly
this, resolve_bash_source_edges, already existed with tests but had no call site
and no raw_calls/bash_sources to work from.
extract_bash now emits `bash_sources` (the files it `source`s) and `raw_calls`
(calls whose callee isn't defined locally), and the pipeline runs them through
resolve_bash_source_edges after the id-remap passes, so caller and function node
ids are final and the already-emitted source edge is de-duped. Resolution is
scoped to the source relationship: a call to an external command never binds to a
same-named function in an unsourced file, and bash raw_calls are excluded from the
generic global-name resolver for the same reason.
HerenderKumar
bdcae25a26