diff --git a/.gitignore b/.gitignore
index fc41e9eb..e6c02b43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,7 +68,7 @@ web_modules/
 
 # Output of 'npm pack'
 *.tgz
-!agoric-synthetic-chain-*.tgz
+!agoric-synthetic-chain*.tgz
 
 # Yarn Integrity file
 .yarn-integrity
@@ -135,5 +135,5 @@ dist
 
 # build in CI
 Dockerfile
-docker-bake.json
+docker-bake.*
 /upgrade-test-scripts
diff --git a/README.md b/README.md
index c50f9d7b..a25fe18e 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,24 @@ To run the tests for particular proposals,
 tsx packages/synthetic-chain test --match upgrade
 ```
 
+To use a local build of synthetic-chain,
+
+```sh
+cd packages/synthetic-chain
+npm pack
+cd -
+
+for p in $(ls proposals); do
+    cp -f packages/synthetic-chain/agoric-synthetic-chain-*.tgz proposals/$p/agoric-synthetic-chain.tgz
+    cd proposals/$p
+    yarn install
+    cd -
+done
+rm -f packages/synthetic-chain/agoric-synthetic-chain-*.tgz
+```
+
+Then find-replace the "@agoric/synthetic-chain" version in package.json with ""file:agoric-synthetic-chain.tgz".
+
 ## Debugging
 
 To get the local files into the container, use a [bind mount](https://docs.docker.com/storage/bind-mounts/). E.g.
diff --git a/packages/synthetic-chain/cli.ts b/packages/synthetic-chain/cli.ts
index f728d335..a913f231 100755
--- a/packages/synthetic-chain/cli.ts
+++ b/packages/synthetic-chain/cli.ts
@@ -50,10 +50,9 @@ doctor          - diagnostics and quick fixes
  * Put into places files that building depends upon.
  */
 const prepareDockerBuild = () => {
-  execSync(
-    // XXX very brittle
-    'cp -r node_modules/@agoric/synthetic-chain/upgrade-test-scripts .',
-  );
+  // XXX file copy very brittle
+  execSync('cp -r node_modules/@agoric/synthetic-chain/upgrade-test-scripts .');
+  execSync('cp -r node_modules/@agoric/synthetic-chain/docker-bake.hcl .');
   writeDockerfile(allProposals, buildConfig.fromTag);
   writeBakefileProposals(allProposals);
   buildProposalSubmissions(proposals);
diff --git a/docker-bake.hcl b/packages/synthetic-chain/docker-bake.hcl
similarity index 100%
rename from docker-bake.hcl
rename to packages/synthetic-chain/docker-bake.hcl
diff --git a/packages/synthetic-chain/package.json b/packages/synthetic-chain/package.json
index 1b5512ce..1cfd0a4d 100644
--- a/packages/synthetic-chain/package.json
+++ b/packages/synthetic-chain/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@agoric/synthetic-chain",
-  "version": "0.0.3",
+  "version": "0.0.4-2",
   "description": "Utilities to build a chain and test proposals atop it",
   "bin": "./cli.ts",
   "main": "cli.ts",
@@ -8,6 +8,7 @@
   "files": [
     "index.js",
     "cli.ts",
+    "docker-bake.hcl",
     "src",
     "upgrade-test-scripts"
   ],
@@ -17,7 +18,9 @@
     "test:xs": "exit 0"
   },
   "dependencies": {
+    "@endo/zip": "^1.0.0",
     "better-sqlite3": "^9.2.2",
+    "execa": "^8.0.1",
     "tsx": "^3.12.8",
     "typescript": "^5.3.3"
   },
diff --git a/packages/synthetic-chain/src/cli/build.ts b/packages/synthetic-chain/src/cli/build.ts
index 5753bb23..c4405c2b 100755
--- a/packages/synthetic-chain/src/cli/build.ts
+++ b/packages/synthetic-chain/src/cli/build.ts
@@ -23,7 +23,7 @@ export function readBuildConfig(root: string): AgoricSyntheticChainConfig {
   const { agoricSyntheticChain } = JSON.parse(packageJson);
 
   const config = { ...defaultConfig, ...agoricSyntheticChain };
-  // TODO mustMatch a shape
+  // UNTIL https://github.com/Agoric/agoric-3-proposals/issues/77
   return config;
 }
 
diff --git a/packages/synthetic-chain/src/cli/dockerfileGen.ts b/packages/synthetic-chain/src/cli/dockerfileGen.ts
index 7da2158b..813ac158 100755
--- a/packages/synthetic-chain/src/cli/dockerfileGen.ts
+++ b/packages/synthetic-chain/src/cli/dockerfileGen.ts
@@ -117,7 +117,7 @@ WORKDIR /usr/src/upgrade-test-scripts
 COPY --link ./upgrade-test-scripts/install_deps.sh /usr/src/upgrade-test-scripts/
 RUN --mount=type=cache,target=/root/.yarn ./install_deps.sh ${proposalIdentifier}:${proposalName}
 
-COPY --link --chmod=755 ./upgrade-test-scripts/run_eval.sh /usr/src/upgrade-test-scripts/
+COPY --link --chmod=755 ./upgrade-test-scripts/*eval* /usr/src/upgrade-test-scripts/
 SHELL ["/bin/bash", "-c"]
 RUN ./run_eval.sh ${proposalIdentifier}:${proposalName}
 `;
@@ -216,21 +216,28 @@ export function writeDockerfile(
     };
   }
   for (const proposal of allProposals) {
-    //   UNTIL region support https://github.com/microsoft/vscode-docker/issues/230
+    // UNTIL region support https://github.com/microsoft/vscode-docker/issues/230
     blocks.push(
       `#----------------\n# ${proposal.proposalName}\n#----------------`,
     );
 
-    if (proposal.type === '/agoric.swingset.CoreEvalProposal') {
-      blocks.push(stage.EVAL(proposal, previousProposal!));
-    } else if (proposal.type === 'Software Upgrade Proposal') {
-      // handle the first proposal specially
-      if (previousProposal) {
-        blocks.push(stage.PREPARE(proposal, previousProposal));
-      } else {
-        blocks.push(stage.START(proposal.proposalName, proposal.planName));
-      }
-      blocks.push(stage.EXECUTE(proposal));
+    switch (proposal.type) {
+      case '/agoric.swingset.CoreEvalProposal':
+        blocks.push(stage.EVAL(proposal, previousProposal!));
+        break;
+      case 'Software Upgrade Proposal':
+        // handle the first proposal specially
+        if (previousProposal) {
+          blocks.push(stage.PREPARE(proposal, previousProposal));
+        } else {
+          blocks.push(stage.START(proposal.proposalName, proposal.planName));
+        }
+        blocks.push(stage.EXECUTE(proposal));
+        break;
+      default:
+        // UNTIL https://github.com/Agoric/agoric-3-proposals/issues/77
+        // @ts-expect-error exhaustive switch narrowed type to `never`
+        throw new Error(`unsupported proposal type ${proposal.type}`);
     }
 
     // The stages must be output in dependency order because if the builder finds a FROM
diff --git a/packages/synthetic-chain/src/cli/proposals.ts b/packages/synthetic-chain/src/cli/proposals.ts
index 246b5dcf..237443b5 100644
--- a/packages/synthetic-chain/src/cli/proposals.ts
+++ b/packages/synthetic-chain/src/cli/proposals.ts
@@ -33,7 +33,7 @@ function readInfo(proposalPath: string): ProposalInfo {
   const packageJsonPath = path.join('proposals', proposalPath, 'package.json');
   const packageJson = fs.readFileSync(packageJsonPath, 'utf-8');
   const { agoricProposal } = JSON.parse(packageJson);
-  // TODO mustMatch a shape
+  // UNTIL https://github.com/Agoric/agoric-3-proposals/issues/77
   assert(agoricProposal, 'missing agoricProposal in package.json');
   const [proposalIdentifier, proposalName] = proposalPath.split(':');
   return {
diff --git a/proposals/b:zoe1/core-eval-support.js b/packages/synthetic-chain/src/lib/core-eval-support.ts
similarity index 68%
rename from proposals/b:zoe1/core-eval-support.js
rename to packages/synthetic-chain/src/lib/core-eval-support.ts
index 98a7af45..3604293d 100644
--- a/proposals/b:zoe1/core-eval-support.js
+++ b/packages/synthetic-chain/src/lib/core-eval-support.ts
@@ -1,4 +1,5 @@
-// @ts-check
+import * as fsp from 'node:fs/promises';
+
 import {
   Far,
   makeMarshal,
@@ -27,7 +28,7 @@ const makeBoardUnmarshal = () => {
   return makeMarshal(convertValToSlot, convertSlotToVal);
 };
 
-export const getContractInfo = async (path, io = {}) => {
+export const getContractInfo = async (path, io = {} as any) => {
   const m = makeBoardUnmarshal();
   const {
     agoric: { follow = agoric.follow },
@@ -57,10 +58,10 @@ export const testIncludes = (t, needle, haystack, label, sense = true) => {
 };
 
 /**
- * @param {Record<string, string>} record - e.g. { color: 'blue' }
- * @returns {string[]} - e.g. ['--color', 'blue']
+ * @param record - e.g. { color: 'blue' }
+ * @returns e.g. ['--color', 'blue']
  */
-export const flags = record => {
+export const flags = (record: Record<string, string>): string[] => {
   return Object.entries(record)
     .map(([k, v]) => [`--${k}`, v])
     .flat();
@@ -77,9 +78,9 @@ export const loadedBundleIds = swingstore => {
 };
 
 /**
- * @param {string} cacheFn - e.g. /home/me.agoric/cache/b1-DEADBEEF.json
+ * @param cacheFn - e.g. /home/me.agoric/cache/b1-DEADBEEF.json
  */
-export const bundleDetail = cacheFn => {
+export const bundleDetail = (cacheFn: string) => {
   const fileName = NonNullish(cacheFn.split('/').at(-1));
   const id = fileName.replace(/\.json$/, '');
   const hash = id.replace(/^b1-/, '');
@@ -90,23 +91,21 @@ const importBundleCost = (bytes, price = 0.002) => {
   return bytes * price;
 };
 
-/**
- * @typedef {{
- *   bundles: string[],
- *   evals: { permit: string; script: string }[],
- * }} ProposalInfo
- */
+export type BundleInfo = {
+  bundles: string[];
+  evals: { permit: string; script: string }[];
+};
 
-/**
- * @param {number} myIST
- * @param {number} cost
- * @param {{
- *  unit?: number, padding?: number, minInitialDebt?: number,
- *  collateralPrice: number,
- * }} opts
- * @returns
- */
-const mintCalc = (myIST, cost, opts) => {
+const mintCalc = (
+  myIST: number,
+  cost: number,
+  opts: {
+    unit?: number;
+    padding?: number;
+    minInitialDebt?: number;
+    collateralPrice: number;
+  },
+) => {
   const {
     unit = 1_000_000,
     padding = 1,
@@ -120,15 +119,12 @@ const mintCalc = (myIST, cost, opts) => {
   return { wantMinted, giveCollateral, sendValue };
 };
 
-/**
- *
- * @param {ReturnType<typeof import('../lib/agd-lib.js').makeAgd>} agd
- * @param {*} config
- * @param {number} bytes total bytes
- * @param {{ log: (...args: any[]) => void }} io
- * @returns
- */
-export const ensureISTForInstall = async (agd, config, bytes, { log }) => {
+export const ensureISTForInstall = async (
+  agd: ReturnType<typeof import('../lib/agd-lib.js').makeAgd>,
+  config,
+  bytes: number,
+  { log }: { log: (...args: any[]) => void },
+) => {
   const cost = importBundleCost(bytes);
   log({ totalSize: bytes, cost });
   const { installer } = config;
@@ -147,3 +143,17 @@ export const ensureISTForInstall = async (agd, config, bytes, { log }) => {
   log({ wantMinted });
   await mintIST(addr, sendValue, wantMinted, giveCollateral);
 };
+
+export const readBundles = async (dir: string) => {
+  const files = await fsp.readdir(dir);
+  const names = files.filter(f => f.endsWith('.js')).map(f => f.slice(0, -3));
+  const buildAssets = {} as Record<string, BundleInfo>;
+  for (const name of names) {
+    const evals = [{ permit: `${name}-permit.json`, script: `${name}.js` }];
+    const content = await fsp.readFile(`${dir}/${name}.js`, 'utf8');
+    const bundleIds = content.matchAll(/b1-[a-z0-9]+/g);
+    const bundles = Array.from(bundleIds).map(id => `${id}.json`);
+    buildAssets[name] = { evals, bundles };
+  }
+  return buildAssets;
+};
diff --git a/packages/synthetic-chain/src/lib/core-eval.ts b/packages/synthetic-chain/src/lib/core-eval.ts
new file mode 100644
index 00000000..59baca04
--- /dev/null
+++ b/packages/synthetic-chain/src/lib/core-eval.ts
@@ -0,0 +1,265 @@
+import { execFileSync } from 'child_process'; // TODO: use execa
+import * as fsp from 'fs/promises';
+import * as path from 'path';
+import * as process from 'process';
+
+import { ZipReader } from '@endo/zip';
+import dbOpen from 'better-sqlite3';
+
+import assert from 'assert';
+import { makeAgd } from '@agoric/synthetic-chain/src/lib/agd-lib.js';
+import { agoric } from '@agoric/synthetic-chain/src/lib/cliHelper.js';
+import { voteLatestProposalAndWait } from '@agoric/synthetic-chain/src/lib/commonUpgradeHelpers.js';
+import { dbTool } from '@agoric/synthetic-chain/src/lib/vat-status.js';
+import { type WebCache } from '@agoric/synthetic-chain/src/lib/webAsset.js';
+import {
+  BundleInfo,
+  bundleDetail,
+  ensureISTForInstall,
+  flags,
+  getContractInfo,
+  loadedBundleIds,
+  readBundles,
+  txAbbr,
+} from '@agoric/synthetic-chain/src/lib/core-eval-support.js';
+import { step } from '@agoric/synthetic-chain/src/lib/logging.js';
+
+export const staticConfig = {
+  deposit: '10000000ubld', // 10 BLD
+  installer: 'gov1', // as in: agd keys show gov1
+  proposer: 'validator',
+  collateralPrice: 6, // conservatively low price. TODO: look up
+  swingstorePath: '~/.agoric/data/agoric/swingstore.sqlite',
+};
+
+const makeFakeWebCache = (base: string): WebCache => {
+  return {
+    getText(segment: string) {
+      return fsp.readFile(path.join(base, segment), 'utf8');
+    },
+    async storedPath(segment: string) {
+      return path.join(base, segment);
+    },
+    async size(segment: string) {
+      const info = await fsp.stat(path.join(base, segment));
+      return info.size;
+    },
+    toString() {
+      return 'fake web cache';
+    },
+    async remove() {
+      console.warn('noop remove');
+    },
+  };
+};
+
+/**
+ * Provide access to the outside world via context.
+ *
+ * TODO: refactor overlap with mn2-start.test.js
+ *
+ * @param {*} t
+ * @param {object} io
+ */
+const makeTestContext = async staticConfig => {
+  // assume filenames don't overlap
+  const bundleAssets = makeFakeWebCache('submission');
+  console.log(`bundleAssets: ${bundleAssets}`);
+
+  const config = {
+    bundleAssets,
+    chainId: 'agoriclocal',
+    ...staticConfig,
+  };
+
+  const agd = makeAgd({ execFileSync }).withOpts({
+    keyringBackend: 'test',
+  });
+
+  const dbPath = staticConfig.swingstorePath.replace(/^~/, process.env.HOME!);
+  const swingstore = dbTool(dbOpen(dbPath, { readonly: true }));
+
+  const before = new Map();
+  return { agd, agoric, swingstore, config, before, fetch };
+};
+
+export const passCoreEvalProposal = async (
+  bundleMap: Record<string, BundleInfo>,
+) => {
+  // XXX vestige of Ava
+  const config = {
+    ...staticConfig,
+    bundleInfos: bundleMap,
+  };
+  const context = await makeTestContext(config);
+  const bundleInfos = Object.values(bundleMap);
+
+  await step('bundles not yet installed', async () => {
+    const loaded = loadedBundleIds(context.swingstore);
+    for (const [name, { bundles, evals }] of Object.entries(bundleMap)) {
+      console.log(
+        name,
+        evals[0].script,
+        evals.length,
+        'eval',
+        bundles.length,
+        'bundles',
+      );
+      for (const bundle of bundles) {
+        const { id } = bundleDetail(bundle);
+        assert(!loaded.includes(id));
+      }
+    }
+  });
+
+  const bundleEntry = async (bundle: { endoZipBase64: string }) => {
+    const getZipReader = async () => {
+      const { endoZipBase64 } = bundle;
+      const toBlob = (base64, type = 'application/octet-stream') =>
+        fetch(`data:${type};base64,${base64}`).then(res => res.blob());
+      const zipBlob = await toBlob(endoZipBase64);
+      // https://github.com/endojs/endo/issues/1811#issuecomment-1751499626
+      const buffer = await zipBlob.arrayBuffer();
+      const bytes = new Uint8Array(buffer);
+      return new ZipReader(bytes);
+    };
+
+    const getCompartmentMap = zipRd => {
+      const { content } = zipRd.files.get('compartment-map.json');
+      const td = new TextDecoder();
+      const cmap = JSON.parse(td.decode(content));
+      return cmap;
+    };
+
+    const zipRd = await getZipReader();
+    const cmap = getCompartmentMap(zipRd);
+    return cmap.entry;
+  };
+
+  await step('bundle names: compartmentMap.entry', async () => {
+    const { bundleAssets } = context.config;
+    for (const { bundles, evals } of bundleInfos) {
+      for (const bundleRef of bundles) {
+        const { fileName } = bundleDetail(bundleRef);
+        const bundle = JSON.parse(await bundleAssets.getText(fileName));
+        const entry = await bundleEntry(bundle);
+        console.log(entry, fileName.slice(0, 'b1-12345'.length));
+        assert(entry.compartment);
+        assert(entry.module);
+      }
+    }
+  });
+
+  const sum = (xs: number[]) => xs.reduce((a, b) => a + b, 0);
+
+  const readBundleSizes = async (assets: WebCache) => {
+    const bundleSizes = await Promise.all(
+      bundleInfos
+        .map(({ bundles }) =>
+          bundles.map(b => assets.size(bundleDetail(b).fileName)),
+        )
+        .flat(),
+    );
+    const totalSize = sum(bundleSizes);
+    return { bundleSizes, totalSize };
+  };
+
+  await step('ensure enough IST to install bundles', async () => {
+    const { agd, config } = context;
+    const { totalSize } = await readBundleSizes(config.bundleAssets);
+
+    await ensureISTForInstall(agd, config, totalSize, {
+      log: console.log,
+    });
+  });
+
+  await step('ensure bundles installed', async () => {
+    const { agd, swingstore, agoric, config } = context;
+    const { chainId, bundleAssets } = config;
+    const loaded = loadedBundleIds(swingstore);
+    const from = agd.lookup(config.installer);
+
+    let todo = 0;
+    let done = 0;
+    for (const { bundles } of bundleInfos) {
+      todo += bundles.length;
+      for (const bundle of bundles) {
+        const { id, fileName, endoZipBase64Sha512 } = bundleDetail(bundle);
+        if (loaded.includes(id)) {
+          console.log('bundle already installed', id);
+          done += 1;
+          continue;
+        }
+
+        const bundleRd = await bundleAssets.storedPath(fileName);
+        const result = await agd.tx(
+          ['swingset', 'install-bundle', `@${bundleRd}`, '--gas', 'auto'],
+          { from, chainId, yes: true },
+        );
+        console.log(txAbbr(result));
+        assert.equal(result.code, 0);
+
+        const info = await getContractInfo('bundles', { agoric, prefix: '' });
+        console.log(info);
+        done += 1;
+        assert.deepEqual(info, {
+          endoZipBase64Sha512,
+          error: null,
+          installed: true,
+        });
+      }
+    }
+    assert.equal(todo, done);
+  });
+
+  await step('core eval proposal passes', async () => {
+    const { agd, swingstore, config } = context;
+    const from = agd.lookup(config.proposer);
+    const { chainId, deposit, bundleAssets } = config;
+    const info = { title: config.title, description: config.description };
+    console.log('submit proposal', config.title);
+
+    // double-check that bundles are loaded
+    const loaded = loadedBundleIds(swingstore);
+    for (const { bundles } of bundleInfos) {
+      for (const bundle of bundles) {
+        const { id } = bundleDetail(bundle);
+        if (!loaded.includes(id)) {
+          assert.fail(`bundle ${id} not loaded`);
+        }
+      }
+    }
+
+    const evalNames = bundleInfos
+      .map(({ evals }) => evals)
+      .flat()
+      .map(e => [e.permit, e.script])
+      .flat();
+    const evalPaths = await Promise.all(
+      evalNames.map(e => bundleAssets.storedPath(e)),
+    );
+    const result = await agd.tx(
+      [
+        'gov',
+        'submit-proposal',
+        'swingset-core-eval',
+        ...evalPaths,
+        ...flags({ ...info, deposit }),
+        ...flags({ gas: 'auto', 'gas-adjustment': '1.2' }),
+      ],
+      { from, chainId, yes: true },
+    );
+    console.log(txAbbr(result));
+    assert.equal(result.code, 0);
+
+    const detail = await voteLatestProposalAndWait();
+    console.log(detail.proposal_id, detail.voting_end_time, detail.status);
+    assert.equal(detail.status, 'PROPOSAL_STATUS_PASSED');
+  });
+};
+
+export const evalBundles = async (dir: string) => {
+  const bundleMap = await readBundles(dir);
+
+  await passCoreEvalProposal(bundleMap);
+};
diff --git a/packages/synthetic-chain/src/lib/logging.ts b/packages/synthetic-chain/src/lib/logging.ts
new file mode 100644
index 00000000..879796a6
--- /dev/null
+++ b/packages/synthetic-chain/src/lib/logging.ts
@@ -0,0 +1,5 @@
+export const step = async (name: string, fn: Function) => {
+  console.log('START', name);
+  await fn();
+  console.log('END', name);
+};
diff --git a/packages/synthetic-chain/upgrade-test-scripts/eval_submission.ts b/packages/synthetic-chain/upgrade-test-scripts/eval_submission.ts
new file mode 100644
index 00000000..b75adcc1
--- /dev/null
+++ b/packages/synthetic-chain/upgrade-test-scripts/eval_submission.ts
@@ -0,0 +1,5 @@
+#!/usr/bin/env tsx
+
+import { evalBundles } from '@agoric/synthetic-chain/src/lib/core-eval.js';
+
+await evalBundles('submission');
diff --git a/packages/synthetic-chain/upgrade-test-scripts/run_eval.sh b/packages/synthetic-chain/upgrade-test-scripts/run_eval.sh
index e9027f78..08b7e29a 100755
--- a/packages/synthetic-chain/upgrade-test-scripts/run_eval.sh
+++ b/packages/synthetic-chain/upgrade-test-scripts/run_eval.sh
@@ -10,9 +10,23 @@ PROPOSAL_PATH=$1
 
 startAgd
 
-echo "Agd started. Running eval.sh."
+echo "Agd started. Running CoreEval submission."
 cd /usr/src/proposals/"$PROPOSAL_PATH/" || exit
-./eval.sh
+
+# eval_submission doesn't really need to be .ts but it imports .ts files
+tsx --version || npm install --global tsx
+
+if [ -f "eval.sh" ]; then
+    # this is what the script used to do. Also allows a proposal to override how they are eval-ed
+    echo "Running eval.sh"
+    ./eval.sh
+else
+    # newer proposals declare a submission
+    echo "Running proposal declared in package.json"
+    # copy to run in the proposal package so the dependencies can be resolved
+    cp /usr/src/upgrade-test-scripts/eval_submission.ts .
+    ./eval_submission.ts
+fi
 
 echo "Eval completed. Running 10 blocks and exiting."
 waitForBlock 10
diff --git a/proposals/b:zoe1/eval.sh b/proposals/b:zoe1/eval.sh
deleted file mode 100644
index 3cd7eb7a..00000000
--- a/proposals/b:zoe1/eval.sh
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/bash
-
-# Exit when any command fails
-set -e
-
-source /usr/src/upgrade-test-scripts/env_setup.sh
-
-ls -al
-
-npm install --global tsx
-
-./performActions.ts
-
-# let CORE_EVAL settle
-waitForBlock 5
diff --git a/proposals/b:zoe1/package.json b/proposals/b:zoe1/package.json
index da6d7299..98d16a65 100644
--- a/proposals/b:zoe1/package.json
+++ b/proposals/b:zoe1/package.json
@@ -5,12 +5,8 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "^0.0.1-rc0",
-        "@endo/zip": "^0.2.35",
-        "ava": "^5.3.1",
-        "better-sqlite3": "^8.5.1",
-        "execa": "^7.2.0",
-        "tmp": "^0.2.1"
+        "@agoric/synthetic-chain": "^0.0.4-2",
+        "ava": "^5.3.1"
     },
     "scripts": {
         "agops": "yarn --cwd /usr/src/agoric-sdk/ --silent agops"
diff --git a/proposals/b:zoe1/performActions.ts b/proposals/b:zoe1/performActions.ts
deleted file mode 100755
index 9b8de9f4..00000000
--- a/proposals/b:zoe1/performActions.ts
+++ /dev/null
@@ -1,287 +0,0 @@
-#!/usr/bin/env tsx
-
-import { execFileSync } from 'child_process'; // TODO: use execa
-import * as fsp from 'fs/promises';
-import * as path from 'path';
-import * as process from 'process';
-
-import { ZipReader } from '@endo/zip';
-import dbOpen from 'better-sqlite3';
-
-import assert from 'assert';
-import { makeAgd } from '@agoric/synthetic-chain/src/lib/agd-lib.js';
-import { agoric } from '@agoric/synthetic-chain/src/lib/cliHelper.js';
-import { voteLatestProposalAndWait } from '@agoric/synthetic-chain/src/lib/commonUpgradeHelpers.js';
-import { dbTool } from '@agoric/synthetic-chain/src/lib/vat-status.js';
-import { type WebCache } from '@agoric/synthetic-chain/src/lib/webAsset.js';
-import {
-  type ProposalInfo,
-  bundleDetail,
-  ensureISTForInstall,
-  flags,
-  getContractInfo,
-  loadedBundleIds,
-  txAbbr,
-} from './core-eval-support.js';
-
-// TODO move into core-eval-support
-const readSubmissions = async () => {
-  const files = await fsp.readdir('submission');
-  const names = files.filter(f => f.endsWith('.js')).map(f => f.slice(0, -3));
-  const buildAssets = {} as Record<string, ProposalInfo>;
-  for (const name of names) {
-    const evals = [{ permit: `${name}-permit.json`, script: `${name}.js` }];
-    const content = await fsp.readFile(`submission/${name}.js`, 'utf8');
-    const bundleIds = content.matchAll(/b1-[a-z0-9]+/g);
-    const bundles = Array.from(bundleIds).map(id => `${id}.json`);
-    buildAssets[name] = { evals, bundles };
-  }
-  return buildAssets;
-};
-
-/**
- * URLs of assets, including bundle hashes (to be) agreed by BLD stakers
- */
-const assetInfo = {
-  repo: {
-    name: 'zoe1',
-    description: 'first upgrade of Zoe vat',
-  },
-  buildAssets: await readSubmissions(),
-};
-
-const staticConfig = {
-  deposit: '10000000ubld', // 10 BLD
-  installer: 'gov1', // as in: agd keys show gov1
-  proposer: 'validator',
-  collateralPrice: 6, // conservatively low price. TODO: look up
-  swingstorePath: '~/.agoric/data/agoric/swingstore.sqlite',
-  title: assetInfo.repo.name,
-  description: assetInfo.repo.description,
-  buildInfo: Object.values(assetInfo.buildAssets),
-};
-
-const makeFakeWebCache = (base: string): WebCache => {
-  return {
-    getText(segment: string) {
-      return fsp.readFile(path.join(base, segment), 'utf8');
-    },
-    async storedPath(segment: string) {
-      return path.join(base, segment);
-    },
-    async size(segment: string) {
-      const info = await fsp.stat(path.join(base, segment));
-      return info.size;
-    },
-    toString() {
-      return 'fake web cache';
-    },
-    async remove() {
-      console.warn('noop remove');
-    },
-  };
-};
-
-/**
- * Provide access to the outside world via context.
- *
- * TODO: refactor overlap with mn2-start.test.js
- *
- * @param {*} t
- * @param {object} io
- */
-const makeTestContext = async () => {
-  // assume filenames don't overlap
-  const bundleAssets = makeFakeWebCache('submission');
-  console.log(`bundleAssets: ${bundleAssets}`);
-
-  const config = {
-    bundleAssets,
-    chainId: 'agoriclocal',
-    ...staticConfig,
-  };
-
-  const agd = makeAgd({ execFileSync }).withOpts({
-    keyringBackend: 'test',
-  });
-
-  const dbPath = staticConfig.swingstorePath.replace(/^~/, process.env.HOME!);
-  const swingstore = dbTool(dbOpen(dbPath, { readonly: true }));
-
-  const before = new Map();
-  return { agd, agoric, swingstore, config, before, fetch };
-};
-
-// XXX vestige of Ava
-const context = await makeTestContext();
-
-const step = async (name: string, fn: Function) => {
-  console.log(name);
-  await fn();
-};
-
-await step('bundles not yet installed', async () => {
-  const loaded = loadedBundleIds(context.swingstore);
-  const info = staticConfig.buildInfo;
-  for (const { bundles, evals } of info) {
-    console.log(
-      evals[0].script,
-      evals.length,
-      'eval',
-      bundles.length,
-      'bundles',
-    );
-    for (const bundle of bundles) {
-      const { id } = bundleDetail(bundle);
-      assert(!loaded.includes(id));
-    }
-  }
-});
-
-const bundleEntry = async (bundle: { endoZipBase64: string }) => {
-  const getZipReader = async () => {
-    const { endoZipBase64 } = bundle;
-    const toBlob = (base64, type = 'application/octet-stream') =>
-      fetch(`data:${type};base64,${base64}`).then(res => res.blob());
-    const zipBlob = await toBlob(endoZipBase64);
-    // https://github.com/endojs/endo/issues/1811#issuecomment-1751499626
-    const buffer = await zipBlob.arrayBuffer();
-    const bytes = new Uint8Array(buffer);
-    return new ZipReader(bytes);
-  };
-
-  const getCompartmentMap = zipRd => {
-    const { content } = zipRd.files.get('compartment-map.json');
-    const td = new TextDecoder();
-    const cmap = JSON.parse(td.decode(content));
-    return cmap;
-  };
-
-  const zipRd = await getZipReader();
-  const cmap = getCompartmentMap(zipRd);
-  return cmap.entry;
-};
-
-await step('bundle names: compartmentMap.entry', async () => {
-  const { bundleAssets } = context.config;
-  const info = staticConfig.buildInfo;
-  for (const { bundles, evals } of info) {
-    for (const bundleRef of bundles) {
-      const { fileName } = bundleDetail(bundleRef);
-      const bundle = JSON.parse(await bundleAssets.getText(fileName));
-      const entry = await bundleEntry(bundle);
-      console.log(entry, fileName.slice(0, 'b1-12345'.length));
-      assert(entry.compartment);
-      assert(entry.module);
-    }
-  }
-});
-
-const sum = (xs: number[]) => xs.reduce((a, b) => a + b, 0);
-
-const readBundleSizes = async (assets: WebCache) => {
-  const info = staticConfig.buildInfo;
-  const bundleSizes = await Promise.all(
-    info
-      .map(({ bundles }) =>
-        bundles.map(b => assets.size(bundleDetail(b).fileName)),
-      )
-      .flat(),
-  );
-  const totalSize = sum(bundleSizes);
-  return { bundleSizes, totalSize };
-};
-
-await step('ensure enough IST to install bundles', async () => {
-  const { agd, config } = context;
-  const { totalSize } = await readBundleSizes(config.bundleAssets);
-
-  await ensureISTForInstall(agd, config, totalSize, {
-    log: console.log,
-  });
-});
-
-await step('ensure bundles installed', async () => {
-  const { agd, swingstore, agoric, config } = context;
-  const { chainId, bundleAssets } = config;
-  const loaded = loadedBundleIds(swingstore);
-  const from = agd.lookup(config.installer);
-
-  let todo = 0;
-  let done = 0;
-  for (const { bundles } of staticConfig.buildInfo) {
-    todo += bundles.length;
-    for (const bundle of bundles) {
-      const { id, fileName, endoZipBase64Sha512 } = bundleDetail(bundle);
-      if (loaded.includes(id)) {
-        console.log('bundle already installed', id);
-        done += 1;
-        continue;
-      }
-
-      const bundleRd = await bundleAssets.storedPath(fileName);
-      const result = await agd.tx(
-        ['swingset', 'install-bundle', `@${bundleRd}`, '--gas', 'auto'],
-        { from, chainId, yes: true },
-      );
-      console.log(txAbbr(result));
-      assert.equal(result.code, 0);
-
-      const info = await getContractInfo('bundles', { agoric, prefix: '' });
-      console.log(info);
-      done += 1;
-      assert.deepEqual(info, {
-        endoZipBase64Sha512,
-        error: null,
-        installed: true,
-      });
-    }
-  }
-  assert.equal(todo, done);
-});
-
-await step('core eval proposal passes', async () => {
-  const { agd, swingstore, config } = context;
-  const from = agd.lookup(config.proposer);
-  const { chainId, deposit, bundleAssets } = config;
-  const info = { title: config.title, description: config.description };
-  console.log('submit proposal', config.title);
-
-  // double-check that bundles are loaded
-  const loaded = loadedBundleIds(swingstore);
-  const { buildInfo } = staticConfig;
-  for (const { bundles } of buildInfo) {
-    for (const bundle of bundles) {
-      const { id } = bundleDetail(bundle);
-      if (!loaded.includes(id)) {
-        assert.fail(`bundle ${id} not loaded`);
-      }
-    }
-  }
-
-  const evalNames = buildInfo
-    .map(({ evals }) => evals)
-    .flat()
-    .map(e => [e.permit, e.script])
-    .flat();
-  const evalPaths = await Promise.all(
-    evalNames.map(e => bundleAssets.storedPath(e)),
-  );
-  const result = await agd.tx(
-    [
-      'gov',
-      'submit-proposal',
-      'swingset-core-eval',
-      ...evalPaths,
-      ...flags({ ...info, deposit }),
-      ...flags({ gas: 'auto', 'gas-adjustment': '1.2' }),
-    ],
-    { from, chainId, yes: true },
-  );
-  console.log(txAbbr(result));
-  assert.equal(result.code, 0);
-
-  const detail = await voteLatestProposalAndWait();
-  console.log(detail.proposal_id, detail.voting_end_time, detail.status);
-  assert.equal(detail.status, 'PROPOSAL_STATUS_PASSED');
-});
diff --git a/proposals/b:zoe1/yarn.lock b/proposals/b:zoe1/yarn.lock
index 92856c71..1c6074d3 100644
--- a/proposals/b:zoe1/yarn.lock
+++ b/proposals/b:zoe1/yarn.lock
@@ -5,22 +5,25 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@npm:^0.0.1-rc0":
-  version: 0.0.1
-  resolution: "@agoric/synthetic-chain@npm:0.0.1"
+"@agoric/synthetic-chain@npm:^0.0.4-2":
+  version: 0.0.4-2
+  resolution: "@agoric/synthetic-chain@npm:0.0.4-2"
   dependencies:
+    "@endo/zip": "npm:^1.0.0"
+    better-sqlite3: "npm:^9.2.2"
+    execa: "npm:^8.0.1"
     tsx: "npm:^3.12.8"
     typescript: "npm:^5.3.3"
   bin:
     synthetic-chain: cli.ts
-  checksum: 58310d95f8ec2681423c64c2be6405f37c5512dc798f80e216b40aa3fcdd55746bb629e9898b25f6f979508f9ae55b89aa51c3341fa55be51c7e7a271ee3973b
+  checksum: 57d18d847f1aa4d037d6ce2cc808e0721bb265ce2890da84865d0cc040453ec1316650f427d93439846ee5f32d5fb4276daa56628a8bc54355c4016baeee991a
   languageName: node
   linkType: hard
 
-"@endo/zip@npm:^0.2.35":
-  version: 0.2.35
-  resolution: "@endo/zip@npm:0.2.35"
-  checksum: bb81c085e47a5d67342dcc039b2f471e4679e08de95cea3cdba598e2644125ec0b2002e7a1d3ff9a10977380487a58688d7e2c4d1d5525c16e46fed4b735372d
+"@endo/zip@npm:^1.0.0":
+  version: 1.0.1
+  resolution: "@endo/zip@npm:1.0.1"
+  checksum: 1074bdc10287f4c94b3423e130da88f9c6ba09c999483c1164b3eed061350a060d2dbe377cfa3b8d4a86b3f1c3aed5cbf0cdd78ee2bf2cb9b837caa2ebbf712f
   languageName: node
   linkType: hard
 
@@ -442,14 +445,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"better-sqlite3@npm:^8.5.1":
-  version: 8.7.0
-  resolution: "better-sqlite3@npm:8.7.0"
+"better-sqlite3@npm:^9.2.2":
+  version: 9.3.0
+  resolution: "better-sqlite3@npm:9.3.0"
   dependencies:
     bindings: "npm:^1.5.0"
     node-gyp: "npm:latest"
     prebuild-install: "npm:^7.1.1"
-  checksum: 2583401b08531eee74c083c73f3a5902bc142b0e1c16de5b9caa92ee94f544e2cb512c214de2f762a6c83e593f26f70013214344a9ea66ace6d0619efbf04a1e
+  checksum: 08943620079dd3f7de7e12a7cb63b9a6ca5b399ca3e06363f120b2589c86cadef2eca56558243bfaf930fb28b4d956ab0b3910bc8b09a35276670efe7b7c516c
   languageName: node
   linkType: hard
 
@@ -487,16 +490,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"brace-expansion@npm:^1.1.7":
-  version: 1.1.11
-  resolution: "brace-expansion@npm:1.1.11"
-  dependencies:
-    balanced-match: "npm:^1.0.0"
-    concat-map: "npm:0.0.1"
-  checksum: 695a56cd058096a7cb71fb09d9d6a7070113c7be516699ed361317aca2ec169f618e28b8af352e02ab4233fb54eb0168460a40dc320bab0034b36ab59aaad668
-  languageName: node
-  linkType: hard
-
 "brace-expansion@npm:^2.0.1":
   version: 2.0.1
   resolution: "brace-expansion@npm:2.0.1"
@@ -705,13 +698,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"concat-map@npm:0.0.1":
-  version: 0.0.1
-  resolution: "concat-map@npm:0.0.1"
-  checksum: c996b1cfdf95b6c90fee4dae37e332c8b6eb7d106430c17d538034c0ad9a1630cb194d2ab37293b1bdd4d779494beee7786d586a50bd9376fd6f7bcc2bd4c98f
-  languageName: node
-  linkType: hard
-
 "concordance@npm:^5.0.4":
   version: 5.0.4
   resolution: "concordance@npm:5.0.4"
@@ -983,20 +969,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:^7.2.0":
-  version: 7.2.0
-  resolution: "execa@npm:7.2.0"
+"execa@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
     cross-spawn: "npm:^7.0.3"
-    get-stream: "npm:^6.0.1"
-    human-signals: "npm:^4.3.0"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
     is-stream: "npm:^3.0.0"
     merge-stream: "npm:^2.0.0"
     npm-run-path: "npm:^5.1.0"
     onetime: "npm:^6.0.0"
-    signal-exit: "npm:^3.0.7"
+    signal-exit: "npm:^4.1.0"
     strip-final-newline: "npm:^3.0.0"
-  checksum: 098cd6a1bc26d509e5402c43f4971736450b84d058391820c6f237aeec6436963e006fd8423c9722f148c53da86aa50045929c7278b5522197dff802d10f9885
+  checksum: 2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
   linkType: hard
 
@@ -1114,13 +1100,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fs.realpath@npm:^1.0.0":
-  version: 1.0.0
-  resolution: "fs.realpath@npm:1.0.0"
-  checksum: 444cf1291d997165dfd4c0d58b69f0e4782bfd9149fd72faa4fe299e68e0e93d6db941660b37dd29153bf7186672ececa3b50b7e7249477b03fdf850f287c948
-  languageName: node
-  linkType: hard
-
 "fsevents@npm:~2.3.2, fsevents@npm:~2.3.3":
   version: 2.3.3
   resolution: "fsevents@npm:2.3.3"
@@ -1147,10 +1126,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-stream@npm:^6.0.1":
-  version: 6.0.1
-  resolution: "get-stream@npm:6.0.1"
-  checksum: 49825d57d3fd6964228e6200a58169464b8e8970489b3acdc24906c782fb7f01f9f56f8e6653c4a50713771d6658f7cfe051e5eb8c12e334138c9c918b296341
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
   languageName: node
   linkType: hard
 
@@ -1194,20 +1173,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"glob@npm:^7.1.3":
-  version: 7.2.3
-  resolution: "glob@npm:7.2.3"
-  dependencies:
-    fs.realpath: "npm:^1.0.0"
-    inflight: "npm:^1.0.4"
-    inherits: "npm:2"
-    minimatch: "npm:^3.1.1"
-    once: "npm:^1.3.0"
-    path-is-absolute: "npm:^1.0.0"
-  checksum: 65676153e2b0c9095100fe7f25a778bf45608eeb32c6048cf307f579649bcc30353277b3b898a3792602c65764e5baa4f643714dfbdfd64ea271d210c7a425fe
-  languageName: node
-  linkType: hard
-
 "globby@npm:^13.1.4":
   version: 13.2.2
   resolution: "globby@npm:13.2.2"
@@ -1255,10 +1220,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^4.3.0":
-  version: 4.3.1
-  resolution: "human-signals@npm:4.3.1"
-  checksum: 40498b33fe139f5cc4ef5d2f95eb1803d6318ac1b1c63eaf14eeed5484d26332c828de4a5a05676b6c83d7b9e57727c59addb4b1dea19cb8d71e83689e5b336c
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
   linkType: hard
 
@@ -1313,17 +1278,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"inflight@npm:^1.0.4":
-  version: 1.0.6
-  resolution: "inflight@npm:1.0.6"
-  dependencies:
-    once: "npm:^1.3.0"
-    wrappy: "npm:1"
-  checksum: 7faca22584600a9dc5b9fca2cd5feb7135ac8c935449837b315676b4c90aa4f391ec4f42240178244b5a34e8bede1948627fda392ca3191522fc46b34e985ab2
-  languageName: node
-  linkType: hard
-
-"inherits@npm:2, inherits@npm:^2.0.3, inherits@npm:^2.0.4":
+"inherits@npm:^2.0.3, inherits@npm:^2.0.4":
   version: 2.0.4
   resolution: "inherits@npm:2.0.4"
   checksum: 4e531f648b29039fb7426fb94075e6545faa1eb9fe83c29f0b6d9e7263aceb4289d2d4557db0d428188eeb449cc7c5e77b0a0b2c4e248ff2a65933a0dee49ef2
@@ -1618,15 +1573,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"minimatch@npm:^3.1.1":
-  version: 3.1.2
-  resolution: "minimatch@npm:3.1.2"
-  dependencies:
-    brace-expansion: "npm:^1.1.7"
-  checksum: 0262810a8fc2e72cca45d6fd86bd349eee435eb95ac6aa45c9ea2180e7ee875ef44c32b55b5973ceabe95ea12682f6e3725cbb63d7a2d1da3ae1163c8b210311
-  languageName: node
-  linkType: hard
-
 "minimatch@npm:^9.0.1":
   version: 9.0.3
   resolution: "minimatch@npm:9.0.3"
@@ -1834,7 +1780,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"once@npm:^1.3.0, once@npm:^1.3.1, once@npm:^1.4.0":
+"once@npm:^1.3.1, once@npm:^1.4.0":
   version: 1.4.0
   resolution: "once@npm:1.4.0"
   dependencies:
@@ -1925,13 +1871,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"path-is-absolute@npm:^1.0.0":
-  version: 1.0.1
-  resolution: "path-is-absolute@npm:1.0.1"
-  checksum: 127da03c82172a2a50099cddbf02510c1791fc2cc5f7713ddb613a56838db1e8168b121a920079d052e0936c23005562059756d653b7c544c53185efe53be078
-  languageName: node
-  linkType: hard
-
 "path-key@npm:^3.1.0":
   version: 3.1.1
   resolution: "path-key@npm:3.1.1"
@@ -2132,27 +2071,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"rimraf@npm:^3.0.0":
-  version: 3.0.2
-  resolution: "rimraf@npm:3.0.2"
-  dependencies:
-    glob: "npm:^7.1.3"
-  bin:
-    rimraf: bin.js
-  checksum: 9cb7757acb489bd83757ba1a274ab545eafd75598a9d817e0c3f8b164238dd90eba50d6b848bd4dcc5f3040912e882dc7ba71653e35af660d77b25c381d402e8
-  languageName: node
-  linkType: hard
-
 "root-workspace-0b6124@workspace:.":
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
-    "@endo/zip": "npm:^0.2.35"
+    "@agoric/synthetic-chain": "npm:^0.0.4-2"
     ava: "npm:^5.3.1"
-    better-sqlite3: "npm:^8.5.1"
-    execa: "npm:^7.2.0"
-    tmp: "npm:^0.2.1"
   languageName: unknown
   linkType: soft
 
@@ -2215,14 +2139,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"signal-exit@npm:^3.0.7":
-  version: 3.0.7
-  resolution: "signal-exit@npm:3.0.7"
-  checksum: 25d272fa73e146048565e08f3309d5b942c1979a6f4a58a8c59d5fa299728e9c2fcd1a759ec870863b1fd38653670240cd420dad2ad9330c71f36608a6a1c912
-  languageName: node
-  linkType: hard
-
-"signal-exit@npm:^4.0.1":
+"signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
   version: 4.1.0
   resolution: "signal-exit@npm:4.1.0"
   checksum: 41602dce540e46d599edba9d9860193398d135f7ff72cab629db5171516cfae628d21e7bfccde1bbfdf11c48726bc2a6d1a8fb8701125852fbfda7cf19c6aa83
@@ -2462,15 +2379,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"tmp@npm:^0.2.1":
-  version: 0.2.1
-  resolution: "tmp@npm:0.2.1"
-  dependencies:
-    rimraf: "npm:^3.0.0"
-  checksum: 67607aa012059c9ce697bee820ee51bc0f39b29a8766def4f92d3f764d67c7cf9205d537d24e0cb1ce9685c40d4c628ead010910118ea18348666b5c46ed9123
-  languageName: node
-  linkType: hard
-
 "to-regex-range@npm:^5.0.1":
   version: 5.0.1
   resolution: "to-regex-range@npm:5.0.1"
diff --git a/yarn.lock b/yarn.lock
index 4e415b56..bd78edcb 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9,9 +9,11 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@agoric/synthetic-chain@workspace:packages/synthetic-chain"
   dependencies:
+    "@endo/zip": "npm:^1.0.0"
     "@types/node": "npm:^18.11.9"
     ava: "npm:^5.3.0"
     better-sqlite3: "npm:^9.2.2"
+    execa: "npm:^8.0.1"
     tsx: "npm:^3.12.8"
     typescript: "npm:^5.3.3"
   bin:
@@ -19,6 +21,13 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@endo/zip@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "@endo/zip@npm:1.0.0"
+  checksum: e61d49a995c3fbada7051611d6a0851927a7bc53e8c81b778a8350731d5ce54ddd6a2a82b4518979c627e46372c8cb7bd3acc89d4f26a80c74a5cc98a97d58e5
+  languageName: node
+  linkType: hard
+
 "@esbuild/android-arm64@npm:0.18.20":
   version: 0.18.20
   resolution: "@esbuild/android-arm64@npm:0.18.20"
@@ -722,7 +731,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cross-spawn@npm:^7.0.0":
+"cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.3":
   version: 7.0.3
   resolution: "cross-spawn@npm:7.0.3"
   dependencies:
@@ -970,6 +979,23 @@ __metadata:
   languageName: node
   linkType: hard
 
+"execa@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
+  dependencies:
+    cross-spawn: "npm:^7.0.3"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
+    is-stream: "npm:^3.0.0"
+    merge-stream: "npm:^2.0.0"
+    npm-run-path: "npm:^5.1.0"
+    onetime: "npm:^6.0.0"
+    signal-exit: "npm:^4.1.0"
+    strip-final-newline: "npm:^3.0.0"
+  checksum: 2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
+  languageName: node
+  linkType: hard
+
 "expand-template@npm:^2.0.3":
   version: 2.0.3
   resolution: "expand-template@npm:2.0.3"
@@ -1110,6 +1136,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
+  languageName: node
+  linkType: hard
+
 "get-tsconfig@npm:^4.7.2":
   version: 4.7.2
   resolution: "get-tsconfig@npm:4.7.2"
@@ -1197,6 +1230,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
+  languageName: node
+  linkType: hard
+
 "iconv-lite@npm:^0.6.2":
   version: 0.6.3
   resolution: "iconv-lite@npm:0.6.3"
@@ -1350,6 +1390,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"is-stream@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "is-stream@npm:3.0.0"
+  checksum: eb2f7127af02ee9aa2a0237b730e47ac2de0d4e76a4a905a50a11557f2339df5765eaea4ceb8029f1efa978586abe776908720bfcb1900c20c6ec5145f6f29d8
+  languageName: node
+  linkType: hard
+
 "is-unicode-supported@npm:^1.2.0":
   version: 1.3.0
   resolution: "is-unicode-supported@npm:1.3.0"
@@ -1498,6 +1545,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"merge-stream@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "merge-stream@npm:2.0.0"
+  checksum: 867fdbb30a6d58b011449b8885601ec1690c3e41c759ecd5a9d609094f7aed0096c37823ff4a7190ef0b8f22cc86beb7049196ff68c016e3b3c671d0dac91ce5
+  languageName: node
+  linkType: hard
+
 "merge2@npm:^1.3.0, merge2@npm:^1.4.1":
   version: 1.4.1
   resolution: "merge2@npm:1.4.1"
@@ -1727,6 +1781,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"npm-run-path@npm:^5.1.0":
+  version: 5.2.0
+  resolution: "npm-run-path@npm:5.2.0"
+  dependencies:
+    path-key: "npm:^4.0.0"
+  checksum: 7963c1f98e42afebe9524a08b0881477ec145aab34f6018842a315422b25ad40e015bdee709b697571e5efda2ecfa2640ee917d92674e4de1166fa3532a211b1
+  languageName: node
+  linkType: hard
+
 "once@npm:^1.3.1, once@npm:^1.4.0":
   version: 1.4.0
   resolution: "once@npm:1.4.0"
@@ -1736,6 +1799,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"onetime@npm:^6.0.0":
+  version: 6.0.0
+  resolution: "onetime@npm:6.0.0"
+  dependencies:
+    mimic-fn: "npm:^4.0.0"
+  checksum: 4eef7c6abfef697dd4479345a4100c382d73c149d2d56170a54a07418c50816937ad09500e1ed1e79d235989d073a9bade8557122aee24f0576ecde0f392bb6c
+  languageName: node
+  linkType: hard
+
 "p-defer@npm:^1.0.0":
   version: 1.0.0
   resolution: "p-defer@npm:1.0.0"
@@ -1816,6 +1888,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"path-key@npm:^4.0.0":
+  version: 4.0.0
+  resolution: "path-key@npm:4.0.0"
+  checksum: 794efeef32863a65ac312f3c0b0a99f921f3e827ff63afa5cb09a377e202c262b671f7b3832a4e64731003fa94af0263713962d317b9887bd1e0c48a342efba3
+  languageName: node
+  linkType: hard
+
 "path-scurry@npm:^1.10.1":
   version: 1.10.1
   resolution: "path-scurry@npm:1.10.1"
@@ -2079,7 +2158,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"signal-exit@npm:^4.0.1":
+"signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
   version: 4.1.0
   resolution: "signal-exit@npm:4.1.0"
   checksum: 41602dce540e46d599edba9d9860193398d135f7ff72cab629db5171516cfae628d21e7bfccde1bbfdf11c48726bc2a6d1a8fb8701125852fbfda7cf19c6aa83
@@ -2240,6 +2319,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"strip-final-newline@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "strip-final-newline@npm:3.0.0"
+  checksum: a771a17901427bac6293fd416db7577e2bc1c34a19d38351e9d5478c3c415f523f391003b42ed475f27e33a78233035df183525395f731d3bfb8cdcbd4da08ce
+  languageName: node
+  linkType: hard
+
 "strip-json-comments@npm:~2.0.1":
   version: 2.0.1
   resolution: "strip-json-comments@npm:2.0.1"