fix/folder-upload

[TrevorBurgoyne]

Description

• Fix folder upload/deletion recursive logic

PR Checklist

• Merged latest master
• Updated version number in pyproject.toml.
• Added tests for new features or bug fixes.
• Passed all tests
• Update README.md if needed.

Breaking Changes

[Copilot]

Pull request overview

Fixes folder-oriented S3 operations so that uploads don’t generate malformed keys and deletions properly recurse through nested “folders” (prefixes), with additional teardown/cleanup to keep S3-backed tests isolated.

Changes:

• Prevent double slashes when uploading directory contents to a trailing-slash S3 key/prefix.
• Make S3 “folder” deletion recurse into nested prefixes and remove folder marker objects.
• Update MirrorPath.upload_from_mirror to upload folders recursively (and add regression tests + test teardown cleanups).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
S3MP/utils/s3_utils.py	Fixes folder upload key joining and implements recursive deletion of nested prefixes.
S3MP/mirror_path.py	Updates mirror upload to handle folders recursively rather than skipping when the prefix exists.
tests/test_s3_utils.py	Adds regression tests for folder upload/delete behavior and adds fixture teardown cleanup.
tests/test_mirror_path.py	Adds regression tests for folder uploads via MirrorPath and adds teardown cleanup.
tests/test_prefix_queries.py	Adds fixture teardown cleanup to avoid S3 test data leakage across tests.
pyproject.toml	Bumps project version to 0.9.1.
uv.lock	Updates lockfile version entry for s3mp to 0.9.1.