Cache compiled Lua scripts in memory.

specs/script.allium

@@ -89,6 +89,12 @@ surface ScriptRuntimeSurface {
         -- unrestricted host capabilities are unavailable unless explicitly
         -- re-exposed by the host application.
 
+    @guarantee CompiledChunkCache
+        -- Validation and execution share a bounded, process-local cache of Lua
+        -- bytecode keyed by exact source. Cache hits still execute in a fresh
+        -- sandbox with the current host capabilities, limits, hooks, and globals.
+        -- Failed compilation is not cached; bytecode is never persisted.
+
     @guarantee ExplicitHostCapabilities
         -- Host-provided functions are exposed only through an explicit bds.*
         -- capability table, never through ambient global access.