fix: add liveslots-provided globals to vat Compartments

Liveslots does not yet provide any `vatGlobals`, but this ensures that any
ones it does provide in the future will be added to the `endowments` on the
vat's Compartment. We'll use this to populate `makeExternalStore` -type
functions, which want to be globals (because threading them from `vatPowers`
into modules that need them would be too annoying), but must also be in
cahoots with closely-held WeakMaps and "Representative" state management code
from liveslots, as described in #455 and #1846.

closes #1867

packages/SwingSet/src/kernel/vatManager/localVatManager.js

@@ -124,6 +124,7 @@ export function makeLocalVatManagerFactory(tools) {
 
     const endowments = harden({
       ...vatEndowments,
+      ...ls.vatGlobals,
       console: vatConsole,
     });
     const inescapableTransforms = [];

packages/SwingSet/src/kernel/vatManager/nodeWorkerSupervisor.js

@@ -116,6 +116,7 @@ parentPort.on('message', ([type, ...margs]) => {
     const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters);
 
     const endowments = {
+      ...ls.vatGlobals,
       console: makeConsole(`SwingSet:vatWorker`),
     };
 

packages/SwingSet/src/kernel/vatManager/subprocessSupervisor.js

@@ -136,6 +136,7 @@ fromParent.on('data', ([type, ...margs]) => {
     const ls = makeLiveSlots(syscall, vatID, vatPowers, vatParameters);
 
     const endowments = {
+      ...ls.vatGlobals,
       console: makeConsole(`SwingSet:vatWorker`),
     };