Adds test/integration/events.test.ts: raises first-node (which raises the
broker as tier-1 substrate), runs the runtime+audit-logger against that
broker, emits a module and a node event, and asserts they reach the trail
with their metadata read back from ADR 0047 headers (a pure body), plus that
the durable per-consumer queue and mesh.events.dead exchange exist on the
raised broker — asked of the broker, not assumed.
scripts/build-runtime-image.sh builds the self-contained runtime image
(mesh-tools + vendored sdk + audit-logger) it runs, saved to a tar for
MESH_LAB_RUNTIME. The events path itself is verified; the incus raise is the
part a lab run exercises.
Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF
