list: new --sort flag accepts path (default), method, or tag. All sort
modes maintain alias-first grouping for cross-alias queries. method sort
orders GET/POST/PUT/PATCH/DELETE/etc. tag sort uses first tag as primary
key with path and method as tiebreakers.
show: merge path-item-level parameters into operation parameters per
OpenAPI 3.x spec. Path-level params apply to all operations unless
overridden by an operation-level param with the same (name, in) pair.
Uses the operation_ptr to derive the parent path-item pointer and
resolve_json_pointer to access the raw spec.
