S1 upgrades the store: a spec change recreates mesh-store (the server the control
plane reads from), and asserts the data on the named volume survives and the
pool reconnects — the stated window. It also asserts postgres/lavinmq are now
source-tracked modules the mesh can report behind (3.4), the question that could
not form before adoption. S2 does the same for the broker, the harder case: the
push that upgrades it travels over it, so it proves the mesh reconnects to the
bus it just replaced.
Issue 051 (WBS 3.3, 3.4).
Claude-Session: https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx
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