jackfirth / resyntax / #373

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Parameterize current directory in source read/expand operations

The grimoire documents that reading and expanding a file source
parameterizes the current directory to the source's parent directory,
but that parameterization only happened in source-analyze, not in the
source module itself. Now source-read-syntax, source-read-language, and
source-expand (and thus source-can-expand?) each parameterize the
current directory for file-based sources, so relative module imports
resolve correctly no matter the caller's working directory. The
existing parameterization in source-analyze stays, since it calls
expand directly rather than source-expand.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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