[architecture] Hosting: let users change their products — instance

Task 5739 · Done · Architecture · created · updated

_Automatically composed from the parent epic at dispatch time._

Outcome

hosting_changes row + plan-upgrade billing (preview, pending_if_incomplete, inverse-swap revert) + DBOS machine workflow + no-arg host.grow_root op. Children C1 EC2/verdict, C2 API/billing, C3 workflow, C4 node grow, C5 web, C6 docs, C7 dev e2e. Scope-downs: FU-4, FU-6.

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