Perform a non-destructive cross-artifact consistency and quality analysis
Identify underspecified areas in the current feature spec by asking up
Companion implement — execute tasks.md in dependency order, then mark complete
Mark the active spec completed — the Companion workflow's terminal step (writes status: completed)
Companion plan — implementation plan with research & design artifacts
Companion specify — spec.md with prioritized user stories
Companion tasks — user-story phased task list
Create or update the project constitution from interactive or provided