G's grants already carry a state's max-mib onto its bucket (Bucket.MaxBytes, §469); main's second copy of that cap in
BucketStreamConfig and Composed is dropped for G's, and main's tests (the declared cap row, the held bucket raised)
are kept. The checker keeps G's version 0.1 (§368) with main's compositions max-mib 256.
Builds: design 47 G §469, §368; A-277 (since mesh-delivery #206 the grants part carries max-mib)
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
ADR 0593 §1: buscompose's engine moves from mesh-sdk into mesh-grants/internal/buscompose, its golden
user lists unchanged; the controller's raise and assert code is left behind, and the merged switch
test runs inside the part's whole integration test.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
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