Execute runtime variable event descriptors

docs/runtime-rehost-plan.md

@@ -75,6 +75,9 @@ Implemented today:
 - the recovered whole-game scalar economy/performance strip `59..104` now has a bounded runtime
   landing surface too: representative descriptors import as `SetWorldScalarOverride` and land in
   `RuntimeState.world_scalar_overrides`
+- the runtime-variable strip `39..54` now imports and executes too through bounded event-owned
+  world/company/player/territory variable maps, so those descriptors no longer depend on generic
+  evidence parity or ad hoc fixture-only state
 - the grounded aggregate cargo-economics descriptors now execute too: descriptor `105`
   `All Cargo Prices` and descriptors `177..179` `All Cargo Production` / `All Factory Production`
   / `All Farm/Mine Production` import through bounded cargo override surfaces, and the grounded
@@ -130,7 +133,8 @@ Implemented today:
   through `RuntimeState.locomotive_catalog` into `RuntimeState.named_locomotive_availability`;
   raw `.smp` inspection/export now reconstructs the save-side locomotive row family and derives the
   catalog directly into save-slice documents, so standalone save-slice imports can execute those
-  rows whenever the save carries enough catalog entries
+  rows whenever the save carries enough catalog entries, and the grounded executable lower prefix
+  now extends through save-backed locomotive id `61` (`Zephyr`)
 - the grounded lower locomotive-cost band `352..409` now imports too through the same save-native
   or embedded catalog into the event-owned `RuntimeState.named_locomotive_cost` map when its
   scalar payloads are nonnegative; the unresolved lower tail and upper cost tail now stay on