change shape of initialize/snapshot transcript entries, slog entries

The load-snapshot event is now `['load-snapshot', { snapshotID }]`, to
make room for other options like which version of xsnap to use.

The save-snapshot event results are still `['ok', hash]` except the
type now thinks of the second element as `snapshotID` instead of
`hash`.

The initialize-worker event is now `['initialize-worker',
workerOptions]`, which records the worker type, as well as the helper
bundle IDs (lockdown/supervisor).

In the slog, the `heap-snapshot-save` event details now contain
`snapshotID` instead of `hash`, to be consistent.

packages/SwingSet/src/kernel/state/vatKeeper.js

@@ -539,7 +539,7 @@ export function makeVatKeeper(
     const info = await manager.makeSnapshot(endPosition, snapStore);
 
     const {
-      hash,
+      hash: snapshotID,
       uncompressedSize,
       rawSaveSeconds,
       compressedSize,
@@ -550,7 +550,7 @@ export function makeVatKeeper(
     addToTranscript({
       d: /** @type {TDSaveSnapshot} */ ['save-snapshot'],
       sc: [],
-      r: /** @type {TDSaveSnapshotResults} */ { status: 'ok', hash },
+      r: /** @type {TDSaveSnapshotResults} */ { status: 'ok', snapshotID },
     });
 
     // then start a new transcript span
@@ -559,16 +559,17 @@ export function makeVatKeeper(
     // then push a load-snapshot entry, so that the current span
     // always starts with an initialize-worker or load-snapshot
     // pseudo-delivery
+    const loadConfig = { snapshotID };
     addToTranscript({
-      d: /** @type {TDLoadSnapshot} */ ['load-snapshot', hash],
+      d: /** @type {TDLoadSnapshot} */ ['load-snapshot', loadConfig],
       sc: [],
       r: { status: 'ok' },
     });
 
     kernelSlog.write({
       type: 'heap-snapshot-save',
       vatID,
-      hash,
+      snapshotID,
       uncompressedSize,
       rawSaveSeconds,
       compressedSize,

packages/SwingSet/src/kernel/vat-warehouse.js

@@ -325,8 +325,9 @@ export function makeVatWarehouse({
     // initialize-worker event, to represent the vatLoader.create()
     // we're about to do
     if (options.useTranscript && vatKeeper.transcriptSize() === 0) {
+      const wo = options.workerOptions;
       vatKeeper.addToTranscript({
-        d: /** @type {TDInitializeWorker} */ ['initialize-worker'],
+        d: /** @type {TDInitializeWorker} */ ['initialize-worker', wo],
         sc: [],
         r: { status: 'ok' },
       });