[sophiecarreras]

Summary

Seven bug fixes found by reviewing the whole default branch, each with a unit test that fails without the fix, plus strengthened versions of tests that could not fail. One known bug that needs a behavior decision is recorded as an xfail with its reason.

Fixes:

• SQLite account info: bind allowed as a parameter; reset upload pools after a schema update.
• Bucket.copy: pass expires, content_disposition, content_encoding and content_language through.
• start_large_file: send customUploadTimestamp under its wire name.
• Replication monitor: no hang when the consumer fails.
• Local folder scan: keep scanning after an unreadable file when no reporter is given.
• Synchronizer.sync_folders: accept reporter=None.
• Parallel downloader: hash the data that was written; surface writer errors instead of blocking producers.

Also adds an sdkharness sync leg for reporter=None. Changelog fragments are included (changelog.d/+*.fixed.md).

Open question for the owners

Synchronizer does not shut its executor down when scheduling fails, so queued actions keep running. Whether to wait for them or cancel them is a behavior choice, so it is an xfail here, not a fix.

How this was checked

• pytest test/unit: 961 passed, 64 skipped, 1 xfailed. ruff check and ruff format --check clean on changed files.
• Each new test was run without its fix (fails) and with it (passes). Strengthened tests were checked by breaking the production line.
• Not run: CI, nox sessions, and integration tests that need B2 credentials.
• The findings and fixes came from an automated review and have not been confirmed by a maintainer yet. Please read the fixes as proposals.

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