Add Prism syntax conformance testing - #3
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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: adff7d4f-9ef2-4616-a7b0-f819cbf53792
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: adff7d4f-9ef2-4616-a7b0-f819cbf53792
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Uses Prism as a syntax oracle without changing the Tree-sitter grammar or runtime parser.
The new CI job checks a pinned
ruby/specrevision and requires every Prism-valid UTF-8 file to parse without Tree-sitter recovery errors. Seven existing parser mismatches are explicitly allowlisted; new mismatches and stale allowlist entries fail CI.The README’s outdated Whitequark AST reference is replaced with a link identifying Prism as the conformance oracle.