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- FillRegion: insert the whole batch in one transaction (store.CreatePlantings) instead of one round-trip per plop, and refuse fills over maxFillPlops (5000) so a max-sized bed with tiny spacing can't generate ~10^5 sequential writes. Guards the computed radius is finite/positive and clamps the region to the object's bounds before packing (bounds hexCenters). - FillNamedRegion + FillRegion share a fillLoaded body, so the object is loaded and authorized once (no double objectForRole). - Region is now rect-only — dropped the speculative circle fields/branch that NamedRegion never produced and hexCenters didn't pack (circles are post-v1). - NamedRegion guards a nil object and no longer maps a blank name to "all" (blank → ErrInvalidInput, matching the doc). - ClearObject documents why it deliberately doesn't require plantable. Tests: empty/nil region name → ErrInvalidInput; an oversized fill → ErrInvalidInput (over the cap). Tagged demo tidied (checked errors, domain.RoleViewer, t.Helper). GOWORK=off go build/vet/test ./internal/... green; tagged agent test green against majordomo (go.mod stays majordomo-free). Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01JdQpdYYsTgtkJBxbcpAszi