gh-153195: Move the syntax error generation rules into a separate grammar file#153197

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serhiy-storchaka:pegen-split-grammar

Commits on Jul 6, 2026

gh-153195: Move the syntax error generation rules into a separate grammar file

serhiy-storchaka
and
claude
committed
Fix two parser generator bugs exposed by inlined error alternatives

serhiy-storchaka
and
claude
committed