test: add files plugin upload + error-handling coverage (50 tests)#319

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jamesbroadhead wants to merge 3 commits intomainfrom

fix/files-plugin-coverage-tests

Commits on Apr 27, 2026

test: add files plugin upload + error-handling coverage (50 tests)
jamesbroadhead
committed

Commits on Apr 28, 2026

test: split upload-and-write.test.ts into focused per-feature files
jamesbroadhead
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test: address ACE multi-model review findings
jamesbroadhead
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