test(good-fences): lend-the-mower journey (red)

The spec is a sequence diagram of the a2030.md story: I lend a governed
mower; the neighbor's harness shows the model only `about`, runs its
code as a tenant, and the governor stops the tipsy tenant at a 2-cell
fence. The test runs the actors through a causal tracer and compares
the trace with the diagram, then checks the yard and what the model saw.

The tracer comes from agoric-sdk PR #12895, extended to name
participants made mid-sequence (governor, tenant) and to draw thrown
errors as replies.

Red: src/ doesn't exist yet (ERR_MODULE_NOT_FOUND for src/fence.ts).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

good-fences/pnpm-lock.yaml

@@ -0,0 +1,41 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      ses:
+        specifier: ^1.14.0
+        version: 1.15.0
+
+packages:
+
+  '@endo/cache-map@1.1.0':
+    resolution: {integrity: sha512-owFGshs/97PDw9oguZqU/px8Lv1d0KjAUtDUiPwKHNXRVUE/jyettEbRoTbNJR1OaI8biMn6bHr9kVJsOh6dXw==}
+
+  '@endo/env-options@1.1.11':
+    resolution: {integrity: sha512-p9OnAPsdqoX4YJsE98e3NBVhIr2iW9gNZxHhAI2/Ul5TdRfoOViItzHzTqrgUVopw6XxA1u1uS6CykLMDUxarA==}
+
+  '@endo/immutable-arraybuffer@1.1.2':
+    resolution: {integrity: sha512-u+NaYB2aqEugQ3u7w3c5QNkPogf8q/xGgsPaqdY6pUiGWtYiTiFspKFcha6+oeZhWXWQ23rf0KrUq0kfuzqYyQ==}
+
+  ses@1.15.0:
+    resolution: {integrity: sha512-Y7RvgVXhkwQEqVActNn44QBxB2BCUbPfexAaMiUFjbJkDXDnxPisQC5jYQeWOZ3QBOfecnmLfPn0sQKLiYGBAQ==}
+
+snapshots:
+
+  '@endo/cache-map@1.1.0': {}
+
+  '@endo/env-options@1.1.11': {}
+
+  '@endo/immutable-arraybuffer@1.1.2': {}
+
+  ses@1.15.0:
+    dependencies:
+      '@endo/cache-map': 1.1.0
+      '@endo/env-options': 1.1.11
+      '@endo/immutable-arraybuffer': 1.1.2