bodgit / sevenzip / 38044473173

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fix: fail reads that end before the declared entry size (#490)

* fix: fail reads that end before the declared entry size

A wrong password on an AES-encrypted 7z stream can make the decoder
return io.EOF before UncompressedSize bytes were produced, so callers
saw an empty file and a clean EOF. Convert that early EOF into a
ReadError wrapping io.ErrUnexpectedEOF, keeping the Encrypted flag so
password handling can react.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* test: expect the short-read error when reading pr472.7z without a password

pr472.7z is encrypted and TestBraRead opens it without a password. The
entry now ends with a ReadError wrapping io.ErrUnexpectedEOF instead of
an empty success, so check for that error; the timeout still guards
against the endless read loop fixed in #476.

Also use require.ErrorIs in the new wrong-password subtest.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* style: Fix lint errors

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Co-authored-by: Roman Kharitonov <hrt@feip.co>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Matt Dainty <matt@bodgit-n-scarper.com>

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