Serve the versioned embedded Command Catalog (21 products / 504 tools) from
NewSchemaCommand instead of only the live tree, matching the prior branch's
release behavior and the GWS flat-leaf / Lark stable-canonical contract. Add
--all and route output through internal/output for --format/--jq/--fields.
Port schema_catalog_test.go asserting 504/21 embedded catalog integrity.
Helper subtree and live Cobra tree remain as fallbacks.