Show the Epic journey

Output contract: Relay requested CLI fields or output faithfully; preserve warnings/errors and only the explanations required below. For suggested actions, pair Shell with the returned Copilot command; honor commandGuidance. If absent, say "Copilot: no verified equivalent"; never invent a slash command.

Boundary: no Story required; cwd=opened Git root or verified repositoryPath from singularity-flow workspace current --json; refuse if neither resolves; never search $HOME/parents.

1. Run singularity-flow epic journey <EPIC-KEY> --json.
2. Render Intake → Requirements → Planning → Story publication → developer delivery → Product Owner completion as an arrow flow.
3. Mark the current stage, completed gates, artifacts, owners, and cross-repository handoffs.
4. Distinguish business review in the VS Code extension's Approvals view from work performed through Copilot skills.
5. Do not change lifecycle state.