The usage queue read drains the proxy. A batch that is then not written (the
client or the bus refuses its shape, an ambiguous key owner, a failed write) is
lost, and the Console showed proxy totals with no sign of it. The reader now
counts these per enabled business since the bus started, the proxy view returns
the count as droppedBatches, and the Console proxy section says so above 0.
A read that failed before the proxy answered or that it refused drained nothing
and is not counted. Telemetry only; no quota reads it. The log line stays
proxy-usage-read-failed.
Ruling 1: model records keep a bounded previous list (64 ids, oldest dropped)
of ids that left by rotation, grace expiry or re-issue; a fire removes the
record. A tokens.keys leaf matches and counts every id in the lineage that
holds it. Lineage ids are unique host-wide. An orphaned leaf limits nothing,
logs one value-free line when it becomes orphaned, and the Console usage
view lists it.
Ruling 2: an agent with no model key under a key quota refuses
key-quota-no-model-key, passed through the broker, launcher and stop reason.
Ruling 3: covered by the lineage; no mayLaunch change.
Ruling 4: the usage module receives a frozen { readUsageQueue } only.
Ruling 5: every telemetry fixture wait races a 5 s real-timer deadline.
jason.woltje