Releases the "pause" and "downloading" status mappings from #16, which
ff-5mp-hass needs before its own clog fix does anything: without this,
a Creator 5 Pro sitting on a detected clog still reads "unknown" for
Machine Status and off for Paused.

Also corrects the #16 changelog's rationale for mapping "downloading"
onto BUSY rather than a new enum member. The concern is real for a
consumer that pins the enum to a fixed list, but ff-5mp-hass is not one:
its ENUM sensor derives its options from MachineState, so a new member
would reach it for free. Keeping BUSY for a patch release regardless -
a new state is a design decision, not a bugfix.

And makes test_empty_status_is_unknown_without_a_warning assert the
absence it is named for; it checked the return value twice and never
looked at caplog, so the no-warning guard was untested.

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TWz3MaKK9nJTTs3EpGjjkf