## Summary
Add the Buzz Mobile vision covering intended experience, architecture,
shared client behavior, verification, release cadence, and critical
functionality. Link it from the mobile README; the existing agent
instruction to read relevant `VISION_*.md` documents makes it
discoverable during planning and review.
### Related issue
No duplicate issue or PR found.
### Testing
Documentation-only change. Diff checks and pre-push hooks passed.
Repository-wide `just ci` is running locally; Rust formatting has
passed.
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Signed-off-by: Tom Brow <tomb@block.xyz>