arc/sync.md                                |  10 +
 crates/notebook/README.md                  |  11 ++
 crates/notebook/examples/scratch_bgsync.rs |  42 ----
 crates/notebook/src/background.rs          | 326 ++++++++++++++++++++++++++++++++
 crates/notebook/src/lib.rs                 |  24 +++
 crates/notebook/src/session.rs             |  84 ++++++--
 crates/notebook/src/smb/remote.rs          |   9 +-
 crates/notebook/src/worker.rs              |  29 +--
 crates/notebook/tests/session.rs           | 126 ++++++++++++
 crates/snowbound/src/library.rs            | 147 +++++++++-----
 crates/snowbound/src/main.rs               |  37 +++-
 crates/snowbound/src/sync.rs               | 139 ++++++++++++--
 12 files changed, 842 insertions(+), 142 deletions(-)