Fix: Show actual parse errors for external Fourmolu/Ormolu#4855

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ijatinydv:fix/external-formatter-errors

Commits on Mar 11, 2026

fix: include stderr in external formatter error notifications

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test: add regression tests for external formatter parse errors

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test: force external mode in formatter regression tests

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test: use lenses to fix ambiguous record fields

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test: strengthen assertions for formatter error tests

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refactor: drop T.strip from error check and update test wording

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test: tighten parse error assertion and document reason

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