jgs-v1-migrate-read

v1→v2 migration read phase: produce a complete structural inventory of a SysML v1 model (packages, blocks, relationships, requirement coverage) as input to a v2 migration plan. PRO tier (read-only). Requires jgs-magic-sysmlv1-mcp. Trigger: "migration inventory", "migrate v1 to v2", "v1 to v2 migration", "structural inventory", "prepare migration plan", "what would migrating this model involve", "read phase".