Implement runtime variable event conditions

docs/runtime-rehost-plan.md

@@ -76,14 +76,17 @@ Implemented today:
   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
+  world/company/player/territory variable maps, and the matching ordinary-condition strip now
+  gates runtime records through those same maps too, so those descriptors and conditions 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
   named cargo-production strip `180..229` now imports through named cargo production overrides too
 - the named cargo-price strip `106..176` now sits on explicit
   `blocked_evidence_blocked_descriptor` parity instead of generic unmapped-descriptor frontier
+- the add-building strip `503..519` is now explicitly classified as recovered shell-owned parity
+  with tracked fixture coverage, not generic unresolved descriptor residue
 - a minimal event-owned train surface and an opaque economic-status lane now exist in runtime
   state, and real descriptors `8` = `Economic Status`, `9` = `Confiscate All`, and `15` =
   `Retire Train` now import and execute through the ordinary runtime path when overlay context