Tag v0.46.2 (`start_directory` fix)

Tag v0.46.1 via v0.46.x branch

With snapshots support upcoming via #587/#590.

v0.46.0 (test coverage for test helpers, #580)

Tag v0.45.0 (test helper refactor from #578)

Tag v0.44.2 (`typing-extensions` import fix, part 2)

Tag v0.44.1 (`typing-extensions` import fix)

Tag v0.44.0 (Add context managers via #566)

Tag v0.43.0 (Add `TestServer` fixture)

Tag v0.42.1 (`typing-extensions` dependency fix)

Tag v0.42.0 (tmux_cmd modernization via #560)