IndexKey and IndexEntry {instance, sequence}: the owner's watcher and the
tool runner's reindex write the same, so a reindex leaves the index as the
watcher keeps it (the lead's ruling on issue 1966 B1; ADR 0597 §4).
MetaCall, mesh/call: the id ApplyRequest.Call names, so the runner stamps
the caller it proved as the operation's author (ADR 0597 §7; the lead's
ruling on issue 1966 B1).
ADR 0595 §9, ADR 0597 §10, design 25 § 12.5: the request and answer types
and method names of the bundle-pipe calls the tool runner serves, apply
naming the tool call it serves (ADR 0597 §7) and answering taken, its
sequence and state behind. It imports nothing of mesh-sdk, so a change
rebuilds only its importers; the package list names it.