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>

examples/library/ui_remount.ludic

@@ -0,0 +1,30 @@
+# ui_remount.ludic - a component that comes and goes: mounted again, it starts as new (its state back
+# to its defaults), and a thousand comings and goings hold the heap flat, because an unmounted
+# instance is put back and mounted again rather than a record, props and model made each time
+import "ludic.ui"
+import "ui_remount_parts/Counter.ludic"
+import "ui_remount_parts/Shown.ludic"
+program UiRemount {
+  numbers float
+  function frame(ui_st: mut UiState) -> UiNode {
+    let root: UiNode = ui_nodes(ui_st, "Shown", null)
+    ui_place(ui_st, root, 0.0, 0.0, 300.0, 200.0)
+    return root
+  }
+  entry (ui_st: mut UiState) {
+    var root = frame(ui_st)
+    let c = root.children[0].children[1]
+    ui_press(ui_st, c.children[1])
+    ui_press(ui_st, c.children[1])
+    root = frame(ui_st)
+    let before = root.children[0].children[1].children[0].text
+    var at = 0
+    for i in 0 .. 2000 {
+      ui_press(ui_st, root.children[0].children[0])
+      root = frame(ui_st)
+      if i == 99 { at = Os.heap_bytes() }
+    }
+    let grew = Os.heap_bytes() - at
+    print(`{before} | {root.children[0].children[1].children[0].text} | heap {grew}`)
+  }
+}

examples/library/ui_remount_parts/Counter.ludic

@@ -0,0 +1,9 @@
+# Counter.ludic - a counter that starts at 0 each time it is mounted
+component Counter {
+  prop label: string
+  prop step: int = 1
+  state count: int = 0
+  doubled: int = count * 2
+  function big() -> bool { return count > 3 }
+  on bump() { count += step }
+}

examples/library/ui_remount_parts/Counter.xml

@@ -0,0 +1,5 @@
+<div class="counter">
+  <p>{label}: {count} ({doubled}){big() ? ' big' : ''}</p>
+  <button on-click="bump()">+</button>
+  <button on-click="set count = 0">reset</button>
+</div>

examples/library/ui_remount_parts/Shown.ludic

@@ -0,0 +1,5 @@
+# Shown.ludic - a counter shown or not: each time it comes back it is a new counter
+component Shown {
+  state on: bool = true
+  on flip() { on = not on }
+}

examples/library/ui_remount_parts/Shown.xml

@@ -0,0 +1,4 @@
+<div>
+  <button on-click="flip()">flip</button>
+  <if test="{on}"><Counter label="c"/></if>
+</div>