fix: resolve stack overflow with circular schema references#1235

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fix/circular-ref-stack-overflow

Commits on Apr 21, 2026

fix: resolve stack overflow with circular schema references
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Commits on Apr 23, 2026

revert: undo previous circular-ref fix attempt
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Commits on Apr 27, 2026

feat(openapi): add Duplicate helper for independent spec copies
andmatei
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refactor(filter): use oasutil.Duplicate instead of private helper
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chore(split): drop warning-only post-filter Validate call
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fix(slice): drop post-slice Validate call that crashes on circular refs
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test(slice): add regression guard for input-file mutation
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refactor(slice): operate on a duplicate instead of mutating in place
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