A seat that cannot remove a tag alone (another tag names its digest) now answers and says kept. The builder ends
that remove there, with no retry, and marks the version kept on its store with the reason and the other tags;
builder_versions shows it, and a later branch end asks it no more. The four seats' kept are consumed.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
The builder hears the forge bridge's stream on a durable consumer: merged, a
pull's closed and branch-deleted ask remove of each tagged version still
held, and the bus gives the message again each minute until all are removed;
past 15 minutes its finding tag-removal-not-done names the seats. The builder
gains the state findings (ADR 0564 §2). Every forge message also wakes a floor
whose bridge_tags was silent.
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
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