Rust workspace with the storage and AI crates, the spark-cli dev tool,
the Tauri + React desktop app (demo mailbox, Smart Inbox, thread view,
composer, command center, settings, bring-your-own-key AI summaries)
and the Docker image for cross-building Windows on ARM binaries.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>