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/rejected/state_component_ro.ludic

@@ -0,0 +1,7 @@
+# 0.S: a component's states are read-only unless its header says mut
+import "ludic.ui"
+program StateComponentRo {
+  state Look { size: int = 1 }
+  import "state_component_ro/Shelf.ludic"
+  entry { print(1) }
+}

examples/rejected/state_component_ro/Shelf.ludic

@@ -0,0 +1,3 @@
+component Shelf (look: Look) {
+  on grow() { look.size += 1 }
+}

examples/rejected/state_component_ro/Shelf.xml

@@ -0,0 +1 @@
+<div><button on-click="grow()">+</button></div>