v0.0.1

Added

• Command-line interface (netimps ... / python -m netimps), built on
  duho and installed by the new cli extra. Eleven subcommands cover the
  diagnostic surface: interfaces, ping, resolve, check, route, mtu,
  scan, addr, source, port, split. Every one takes --json, and exit
  codes distinguish success from "the answer was no" from a caller error.
  duho is CLI-only -- importing the library does not require it.

Full Changelog: v0.0.0...v0.0.1