Remove an unstarted future phase from the roadmap and renumber all subsequent phases to maintain a clean, linear sequence.
Purpose: Clean removal of work you've decided not to do, without polluting context with cancelled/deferred markers.
Output: Phase deleted, all subsequent phases renumbered, git commit as historical record.
@workflows/remove-phase.md
Phase: $ARGUMENTS
Roadmap and state are resolved in-workflow via init phase-op and targeted reads.
Execute the remove-phase workflow from @workflows/remove-phase.md end-to-end.
Preserve all validation gates (future phase check, work check), renumbering logic, and commit.