idlehands 4.0.19

Fixes

• Anton workspace propagation (hard fix): gateway agent RPC now accepts and forwards workspaceDir through to agentCommand, and agentCommand honors per-call workspaceDir before falling back to session/default workspace. Spawned Anton discovery/review/implementation runs now reliably operate in the target workspace.
• Anton discovery plan-first validation: check if the expected plan file exists before evaluating the model's status claim, so a valid plan written by discovery is used even when the model incorrectly reports status=complete.
• Anton completion guard baseline fix: compare repo changes against a pre-task snapshot (taken before discovery starts) instead of immediately before implementation, so changes made during discovery count toward completion verification.
• Anton CLI: idlehands anton run now supports --workspace <dir> for direct workspace targeting without chat-session state.