feat(controllers): #57 foundation — ludic.gameplay package + lever 5 (disable system)

Shared building blocks for the builtin gameplay controllers (#57): the
ludic.gameplay source package (Cooldown timer, Stats + timed modifier stack,
Faction table, Combat damage pipeline with cancel/mutable hooks), plus the
compiler `disable system <esys_fn>` extensibility lever. Deterministic,
integer-only; C-free bootstrap fixpoint holds.

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

packages/ludic.gameplay/package.ludic

@@ -0,0 +1,18 @@
+# ludic.gameplay — the shared foundation for the builtin gameplay controllers.
+#
+# This is the "foundation" phase of the controller layer (#57): the cross-cutting
+# building blocks every genre package (platformer / shooter / RPG / NPC-AI) leans
+# on — a deterministic timer, a stats + timed-modifier stack, a faction
+# relationship table, and a combat pipeline with cancellable/mutable hooks.
+#
+# It ships as an ordinary source package: AOT means these declarations compile
+# straight into the consumer's compile-time ECS, so there is no ABI seam, and the
+# whole thing stays deterministic (integer only) — lockstep, replay and
+# world_save snapshots all hold.
+package "ludic.gameplay"
+version "0.1.0"
+kind source
+provides "Cooldown"
+provides "Stats"
+provides "Faction"
+provides "Combat"