Follow no longer asks the ASSIGNMENTS stream for a copy nor subscribes mesh.assignment; a module with no membership key is said so and served in its derived shape. The test mesh issues memberships where the grants part keeps them. Tests: none added; the stream-fallback assertions of two existing tests are replaced by their state-only counterparts, and the test mesh no longer makes the stream. The two integration tests of the bus were run locally against the embedded bus. (issue 774, 774/S32) Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL