Replace argparse CLI with Typer-based CLI supporting `cohere on/off/status`
commands. The daemon runs transcription in the background and types into the
focused Wayland window via wtype. Adds wtype to flake.nix and fixes the
hatchling build backend.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Split monolithic transcribe.py into focused modules under
src/cohere_transcribe/ (model, vad, stream, cli), move tests into
tests/, add hatchling build system and CLI entry point, remove
unused shell.nix and main.py.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>