The controller ended (ADR 0590): nothing consumes what nodes report on CONTROL, so the mesh no
longer declares the stream, which would make it again before its removal; MeshConsumers is empty,
the controller's consumers and the events it followed go, and the lease holder's reading
(LeaseHolder, LeaseHandedAway) with them. Only the consumers' names stay, for the removal of the
leftovers and the watchman's read of whether controller still stands. Issue 1126 B3b.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
ADR 0582 clause 3 writes the key holder "with the why, the ask and the time": LeaseHolder gains ask and at,
which LeaseHandedAway ignores (it reads handed-to alone). The grants part's user-list key gains lease-handed,
so the bus node's engine follows the grants part's list alone once the lease is handed (ADR 0571 clause 8)
and never falls back to the controller's; a key written before reads false.
Tests: a row in the lease table of TestTheCopiedComposerComposesAsTheControllers; the old key (shaped as
EncodeGrantsUserList writes it today) and the flag's round trip added to the existing user-list case in
delivery_test.go; no new test function.
(issue 774, 774/S3)
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL
jschoubben