KOS_OP_TAIL_CALL_VAR_ATTR_NAMES

• Style: EXTRA. Schema: VAR (name for obj), CONST (attr name), CONST (kwarg names tuple), COUNT (npos). One cache slot.

• Stack: Same layout as CALL_VAR_ATTR_NAMES. Tail semantics as KOS_OP_TAIL_CALL_ATTR: the caller’s frame is reused rather than a new frame pushed.

• Compiler form: Promotion relabel of a tail-position CALL_VAR_ATTR_NAMES; lowers to TAIL_CALL_FAST_ATTR_NAMES.