[kisnner26]

fixes #126.

allow a negative RelativeStream offset to insert a zero-filled prefix before the source data. aligned reads that begin before the source no longer try to seek to a negative position. padding is limited to the requested length and configured stream size, and only the remaining bytes are read from the source.

positive offsets retain the existing RangeStream read path. the docstring explains negative offsets and that an explicit size includes the prefix.

validation: all 18 new parameterized cases fail before the change. after the change, tests/test_stream.py passes 30 tests with two benchmark tests skipped because the benchmark plugin is absent. tests cover multiple prefix lengths and alignments, partial/boundary reads, consecutive reads, eof, seek-from-end, unknown-size streams and an explicit size ending inside the prefix. ruff lint/format, vermin compatibility checks and git diff --check pass for the changed files. git-lfs is unavailable locally, so this validation uses the in-memory stream tests rather than the unrelated lfs-backed archive fixtures.

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