Name resolution for known-UAP addresses

Add name resolution for known-UAP addresses

Run hcitool name against any address with a known UAP: survey
"ready to use" hits and whatever the sweep confirms live via
l2ping. Add --save to append timestamped results (address, name,
source) to a TSV log file, --no-resolve-names to disable
resolution, and --name-timeout to bound each hcitool call.

New modules: resolve.py (hcitool wrapper), log.py (append-only
file writer). Sudo/tool presence checks moved earlier since the
survey step now needs hcitool too.

Tests added for the new args and resolve/log modules. README
updated with usage and flag docs.