Baseline: Ludic compiler + toolchain, Phase 1 syntax fixes complete

Self-hosted compiler (selfhost/*.ludic), runtime, examples, editor tooling,
and docs. Phase 1 of the syntax-redesign cohesion pass has landed:
edge-system fix, signature-query, when-alias, and the documentation truth-pass.
Suite green (14/14), C-free bootstrap fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

selfhost/tests/control.ludic

@@ -0,0 +1,13 @@
+game T {
+  fn fib(n: int) -> int { if n < 2 { return n }  return fib(n-1) + fib(n-2) }
+  main {
+    print_int(fib(10))                 # 55
+    let s = 0
+    for i in 0 .. 10 { if i == 5 { break }  if i % 2 == 0 { continue }  s = s + i }
+    print_int(s)                       # 1+3 = 4
+    let i = 0  let t = 0
+    while true { i = i + 1  if i > 5 { break }  t = t + i }
+    print_int(t)                       # 15
+    if false and (1/0 == 0) { print_int(999) } else { print_int(1) }   # short-circuit: no div by zero
+  }
+}