Advance a task with optimistic revision checks

Intermediate45 min

Implement advance_task(state, new_status, expected_revision), returning a copied local task record with revision incremented when a legal transition occurs.

Your task

Use the local transition table in the starter; it is a teaching model, not the full A2A normative lifecycle.
Reject a revision mismatch, unknown status, or disallowed transition with ValueError.
Terminal states have no outgoing transitions.
Do not mutate the input record; preserve its other fields.

Examples

EXAMPLE 1

Inputstate={'id':'t1','status':'working','revision':1}, new_status='completed', expected_revision=1

Output{'id':'t1','status':'completed','revision':2}

A valid local transition returns a new record.

ALLOWED = {
    'submitted': {'working', 'rejected', 'canceled'},
    'working': {'input_required', 'auth_required', 'completed', 'failed', 'canceled'},
    'input_required': {'working', 'canceled'},
    'auth_required': {'working', 'canceled'},
    'completed': set(), 'failed': set(), 'canceled': set(), 'rejected': set(),
}
def advance_task(state, new_status, expected_revision):
    raise NotImplementedError