ludic.ui: an unmounted component is mounted again rather than made again - its record renewed (a generated renew), its props and model kept; an action's call answers into a ring

A prompt that comes and goes as a player walks (co-op's netleak: in_get, cmp_*_new, bd_class, value_slot/put)
made a new record, props and model on every mount, and an action's call answered into a new Val (ev_call_with).
examples/library/ui_remount: two thousand comings and goings hold the heap at 0, and the counter starts at 0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.ui/backend.ludic

@@ -42,6 +42,8 @@ export state UiState {
   mm_ivals: []Val = null
   ev_depth: int = 0                      # eval.ludic: a call's arguments, in lists kept one a depth
   ev_args: []Val = new []Val
+  ev_ring: []Val = new []Val             # eval.ludic: calls' answers while an action runs, EV_RING of them
+  ev_ring_at: int = 0
   cv_texts: []string = new []string      # units_pieces.ludic: a value's var() pieces, kept
   tx_pieces: [][]string = new [][]string # eval_text.ludic: a text's pieces, a list a depth
   tx_depth: int = 0
@@ -117,6 +119,7 @@ export state UiState {
   in_act_down: bool = false   # A or Enter went down this frame, or came up
   in_act_up: bool = false
   in_list: []UiInst = new []UiInst
+  in_free: []UiInst = new []UiInst     # unmounted instances, each mounted again as its class's next one
   in_build: int = 0
   ly_fg_a: float = 1.0
   ly_lead: float = 0.0