## Goal v1.1: agent_versions. ## Scope - Add `parse_agent_ref` / `format_agent_ref` to `_messages/execution.py` - Add `register_agent_version` / `set_default_agent_version` to `ARCPRuntime` - Add rich `capabilities.agents: list[{name, versions, default?}]` shape to welcome - Raise `AgentVersionNotAvailableError` via `session.error` per §13.7 - Example: `agent_versions/` ## Spec § §6.2, §7.5, §12 ## Risk L
Goal
v1.1: agent_versions.
Scope
parse_agent_ref/format_agent_refto_messages/execution.pyregister_agent_version/set_default_agent_versiontoARCPRuntimecapabilities.agents: list[{name, versions, default?}]shape to welcomeAgentVersionNotAvailableErrorviasession.errorper §13.7agent_versions/Spec §
§6.2, §7.5, §12
Risk
L