⚠️ BREAKING CHANGES ⚠️

Actions are now simple async functions
They can update their status and register teardown hooks using the action: ActionSession parameter
This makes it much easier to write new actions, and chain actions together in more-complex ways
Python function actions are removed, as they are now the default
Actions are no-longer named. Their name is automatically derived from the given function name

✨ NEW ✨

Actions can be infinitely-nested, with this being cleanly displayed in the output
The console output is much more concise, with irrelevant information automatically hiding after steps complete
Many more git operations are built-in actions

Actions automatically succeed if their associated promises resolve without exception
And they automatically fail if an exception is raised
Project is migrated from poetry to uv
MARKTEN_VERBOSITY environment variable can be used to control verbosity of output. Currently this just controls whether a traceback is printed on keyboard interrupt, but will be used in more places in future