v8.0.0-rc.11-dev.34: refactor(psl): track source provenance by syntax root (#30335)

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Linked issue Linear linkage omitted at the author's request. Summary Track PSL source provenance by syntax root rather than independently threading filenames through consumers. This is internal groundwork for future multifile support; existing single-file behavior remains the scope. Changes Require parse(source, filename, options?) ; put filenames and coordinate conversion on SourceFile . Introduce PslSources , mapp…

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