A replayed build is registered exactly as any other and announced to nobody. A
module that moved months ago is not something anything should act on now:
emitting `upgraded` would have the control plane decide about a rollout, and
`rebuild-needed` would ask for builds of things already current.
Asked on every start rather than only the first, because a catalogue cannot tell
whether it has a gap — and the answer is idempotent, so asking when there is none
costs a message. Asked after subscribing, so a build arriving during the replay
is not lost between the two.
Closes novox/hq 04-ISSUES/050 with mesh-control.
Claude-Session: https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx
jschoubben
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