<!-- swain-model-hint: haiku, effort: low -- Roadmap <!-- session-check: SPEC-121 -- Before proceeding with any state-changing operation, check for an active session: If the JSON output has other than , inform the operator: "No active session — start one with ?" Proceed if they dismiss. Regenerates from the artifact graph and opens it. The heavy lifting is done by in swain-design — this skill is the user-facing entry point. When invoked 1. Locate chart.sh If is not found, tell the user swain-design is not installed and stop. 2. Regenerate roadmap Parse the argument: if the user provided an ar…