A registration-changed heard before the registrar was stored, or before the
branch's catalog half was held, placed nothing and was gone: its pipelines kept
no steps. The half becoming held and the registrations' first view now place
every running pipeline with no steps whose registration is held (Waiting), and
the first view also picks up each held branch whose readiness came before the
resume callback was stored.
Builds: design 47 G §21, §23, §54, §88, A-327
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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