Update the authoritative docs, guides, architecture notes, gap list, deployment guidance, handoff notes, and changelog to reflect the current Rust official resource sync boundary.
Add the production-facing official update service and bat-official-sync watch CLI for unattended resource synchronization.
Support launcher-resource discovery without installing the launcher, remote marker snapshots, local manifest audit and repair, official seed hash validation, bootstrap caching, richer Addressables coverage, SQLite resource persistence, and FFI JSON helpers.
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