Add the ranked legacy-interface backlog (T01), rename dashboard navigation and user-facing copy to workplan while preserving wire-compat API keys (T02), and activate the retirement workplan with T01/T02 marked done.
Child workplan for CUST-WP-0055-T02. Phased retirement of metered /workstreams routes, MCP aliases, dashboard labels, and legacy event subjects after STATE-WP-0054 compatibility window.