cargo xtask parity verifies every cmd:/ctl: id and repository path cited in
docs/parity.md exists (engine commands and controls via lightcraft-cli, UI
commands from UI_COMMANDS), that row ids are unique and statuses valid, and prints
the per-section summary; --write refreshes the summary table. ci runs the
reference check after the tests. Parser, checker and summary are unit-tested.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>