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>
