Convenience wrapper for existing DIA users upgrading between DIA versions (e.g. v1 -> v2 -> v3). Runs the migration scripts under `tools/migration/` in sequence: detect state, strip status duplicates, rename IDs (FEATURE-NNNN -> FEAT-EE-FF, EPIC-NNN -> EPIC-NN), flatten analysis/, regenerate BACKLOG.md, update skill-name references, run `/consistency-check` mode A. Idempotent. Use this skill when the user already has DIA artefacts and wants to upgrade to current conventions without the full reverse-engineering walk. Triggers: "migrate to DIA v2", "migrate v1", "upgrade DIA", "convert backlog", "restructure backlog", "FEATURE to FEAT". For BROWNFIELD projects (no `_devprocess/` yet, only code), use `/reverse-engineering` instead -- it absorbs the same migration mechanics for any pre-existing partial artefacts and additionally walks the code to fill the gaps.