The fixed Observers list and the engineModule constant are removed; sources are the modules whose catalog entry declares the
finding events, a module in no branch's revision is cleared (module left the catalog), a stopped module no longer placed is
cleared (module left the node), Keeper.Holder is derived from the entry's claims. The per-branch catalog followers in main.go
wait on a design question (how a part adopts one catalog view per registered branch); the whole integration test is red until then.
Builds: design 47 G §365, §196, §200, §364, §384
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
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