release-v0.81.0

Features

• channel: folder_ops wire behind a runtime switch (S4 support) (#2533) (e874924)
• folders: R9 release D, drop the notes_set_folder_ref triggers (#2524) (afb9dd7)
• notes: R8(d) remove every reference to the notes body ciphertext columns (#2513) (7f9cf3c)

Bug Fixes

• migrations: R8c repair, window, probe bugs (#2550) (c1ad13a)
• notes: a by-path write with base_hash answers 409 instead of creating a duplicate (#2539) (6012182)
• notes: diagnose create-race stale-base 409 (#2548) (65eb2db)
• qdrant: match a note's points by note id, path hash only without n (#2515) (bc0ca3f)

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Full Changelog: release-v0.80.0...release-v0.81.0