v0.3.1: per-node prompts, end-call fix

Patch: per-node prompts and the end-call fix found on a live campaign call.

Added

• agents set-prompt --node agentNode|startCall|globalNode|endCall (repeatable; default agentNode) and node_type on the agents_set_prompt MCP tool, so persona (globalNode), greeting (startCall), and goodbye (endCall) prompts can be set without graph surgery.

Fixed

• Goodbye loop at the end of calls: the skill now carries the prompt contract (agentNode says one goodbye then calls end_call; endCall is one line), verified live (end_call transition executed, call completed in 3 s).

PyPI: https://pypi.org/project/dograh-ctl/0.3.1/