feat(lang): 0.S - components take states in their header; migrate writes them, never inside a name, never outside the programs given, never into a package's state

- component Name (a: mut A, b: B) { ... }: every getter, default, function and event takes the
  header's states before the instance; a member's call to another passes them on; the glue is
  supplied them; the template never sees them; a read-only one is read-only in every member
- ludic migrate state: a component's members' needs go into its header (added to an existing one,
  mut added where now changed); a field read or a member call inside a component is the compiler's,
  so nothing is written inside a name and no ', )' is left; an entry point that declares states
  already gets the rest after them
- a program's module named like a package gets <Name>AppState; a program's own file its own state;
  a friend module's files go by directory; a package's settable var stays state
- it writes only under the programs and directories given (and runtime/ with --runtime), and
  refuses the whole run naming any other file that would have to change
- a name a package already moved into its state is rewritten through it; a read of the runtime's
  var through the runtime function that answers it (gl_w: gl_width())
- a state's instance supplied by the runtime is not a uses reference
- tests: state/component, rejected/state_component_ro, rendering/ui_render3d, migrate component
  and foreign cases

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

examples/rendering/ui_render3d.ludic

@@ -0,0 +1,13 @@
+# ui_render3d.ludic - ludic.ui drawn by render3d's overlay: importing its backend is enough to
+# draw templates (the suite builds it, so the backend always compiles against the renderer)
+program UiRender3d {
+  numbers float
+  import "ludic.render3d/r3d.ludic"
+  import "ludic.ui"
+  import "ludic.ui/render3d.ludic"
+  entry (ui_st: mut UiState) {
+    ui_render3d(ui_st)
+    ui_render3d_scale(ui_st, 1.5)
+    print("ok")
+  }
+}