Fix #16432: Report FS0039 only once for undefined type in inherit clause#19862

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fix/issue-16432

Commits on May 29, 2026

[RED] Add failing tests for issue #16432 - single FS0039 on inherit of unknown type

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fix(checker): dedup FS0039 within a single inherit clause (#16432)

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[GREEN] Dedup FS0039 across inherit-clause type-checking passes

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chore(#16432): release notes for inherit FS0039 dedup

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[REFACTOR] Format and address expert review for #16432
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docs: add PR link to release notes for #16432

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