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>

examples/lib/arena.ludic

@@ -0,0 +1,34 @@
+# ============================================================================
+# arena.ludic — a game that links the Ludic shared library next to it.
+#
+#   ludicc examples/lib/combat.ludic --shared -o build/libcombat.dylib
+#   ludicc examples/lib/arena.ludic  -o build/arena -Lbuild -lcombat
+#
+# `extern fn` binds a name to a symbol resolved at link time. The library the
+# symbols come from happens to be written in Ludic, but nothing here depends on
+# that: the same declaration binds a C, Rust or Zig library just as well. This
+# is how Ludic reaches the outside world without a C shim.
+# ============================================================================
+game Arena {
+
+  extern fn damage(attack: int, armour: int, roll: int) -> int = "damage"
+  extern fn hits_to_kill(hp: int, attack: int, armour: int) -> int = "hits_to_kill"
+  extern fn xp_for(level: int, kills: int) -> int = "xp_for"
+
+  component Fighter { hp: int = 30, attack: int = 9, armour: int = 2 }
+
+  system Boot phase Start {
+    spawn Hero { Fighter = { hp = 40, attack = 12, armour = 3 } }
+    spawn Orc  { Fighter = { hp = 24, attack = 7,  armour = 1 } }
+  }
+
+  system Fight phase Update {
+    for (f) in query [Fighter] {
+      print_int(damage(f.attack, f.armour, 0))
+      print_int(damage(f.attack, f.armour, 20))
+      print_int(hits_to_kill(f.hp, f.attack, f.armour))
+    }
+    print_int(xp_for(3, 4))
+    quit()
+  }
+}

examples/lib/combat.ludic

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+# ============================================================================
+# combat.ludic — a Ludic *library*, not a game.
+#
+# `module` instead of `game` means: no entry point, no frame loop. ludicc
+# compiles this to a real shared object —
+#
+#     ludicc examples/lib/combat.ludic --shared -o build/libcombat.dylib
+#
+# — whose `export fn`s are ordinary C-ABI symbols. Anything that can call a
+# .dylib/.so/.dll can call these: another Ludic program via `extern fn`, a game
+# engine, a test harness, a scripting host. Non-exported functions stay private
+# to the library.
+# ============================================================================
+module Combat {
+
+  const CRIT_MULT: int = 2
+
+  # damage after armour, with a crit multiplier applied on an exact roll
+  export fn damage(attack: int, armour: int, roll: int) -> int {
+    let raw = attack - armour
+    if raw < 1 { raw = 1 }
+    if roll == 20 { raw = raw * CRIT_MULT }
+    return raw
+  }
+
+  # how many hits to drop a target — the loop is here so the caller cannot
+  # accidentally disagree with `damage` about rounding
+  export fn hits_to_kill(hp: int, attack: int, armour: int) -> int {
+    let left = hp
+    let n = 0
+    while left > 0 {
+      left = left - damage(attack, armour, 0)
+      n = n + 1
+    }
+    return n
+  }
+
+  export fn xp_for(level: int, kills: int) -> int {
+    return curve(level) * kills
+  }
+
+  # private: not exported, so it is not a symbol in the library
+  fn curve(level: int) -> int {
+    return 10 + level * level * 3
+  }
+}