refactor: name recovery boundaries and compact IR strings

source/interpreter/interpreter.hon

@@ -35,7 +35,7 @@ Frame :: struct {
 }
 
 #! executes only typed IR; invocation and global state are temporary and released on every exit.
-#! returned strings borrow `module`; runtime source errors are traps, not infrastructure errors.
+#! returned string IDs resolve through `module`; runtime source errors are traps, not infrastructure errors.
 run proc(
     allocator mem.Allocator,
     module @ir.Module,