Add recon: a WiFi and BLE scanner that identifies what it sees

[jgamblin]

Hello! Adding an app I built for BSidesLV and DEF CON.

recon scans WiFi and Bluetooth and tells you what things are rather than
listing MAC addresses. Carried around for an evening it logged 214 access points
and named 86% of them by manufacturer, plus 93% of the Bluetooth devices it
heard, picking out cable-company gateways, Tile trackers, AirPods, smart-home
hubs and a garage-door opener by name.

Everything is passive. It never associates, transmits or captures traffic; every
beacon and advertisement it reads is a public broadcast.

Dashboard	Detail

A dashboard counts what is around you by kind and drills into any row; there are
also live list, per-device detail, flags (open networks, WEP, possible evil
twins, trackers), a vendor ranking, and a persistent de-duplicated log.

One thing to flag before you review

data/ is 763KB of compiled vendor databases (39,877 IEEE MA-L prefixes and
3,988 Bluetooth SIG company IDs, as sorted fixed-width binaries). That is a lot
heavier than the other apps here, so entirely understandable if it is too much
for this repo. Happy to either trim it to the few hundred most common vendors,
or ship the app without the data and have people run the builder themselves.
Just say which you prefer.

Notes

• Passes ci/ruff.toml clean.
• Vendor lookups run from a 195KB in-RAM index (1.8ms vs 11ms off flash) and
  resolve lazily at two devices a frame, so a crowded room never stalls drawing.
• Stress-tested with synthetic devices: every view holds under 10ms a frame up
  to 1800 devices.
• The log takes a bounded 560KB slice of the filesystem and reports when it is
  full rather than silently dropping records.
• Bluetooth counting is deliberately careful. Only stable addresses count as
  devices. Apple Find My beacons look static by their address bits but rotate
  every ~15 minutes, so rotation is decided from the payload too; without that
  one outing counted 356 "devices" that were roughly 55.

Source, plus the database builder, CSV exporter and stress test:
https://github.com/jgamblin/Tufty2350-Badgeware

[jgamblin]

Small update: the scanner now lives in its own repository at https://github.com/jgamblin/tufty-recon rather than alongside my badge faces, so the links in the app README point there. No change to the app itself.

The 763KB data/ question from the description still stands whenever you get to it.