Claude's generic `system/status` subtype carries no detail beyond the
bare label, and previously each tick got its own note row. During a
compaction pass (which emits a burst of these with no other signal
before the completed compact_boundary) this looked like a wall of
identical noise followed by silence, making a routine compaction look
stuck.
Collapse consecutive status ticks into one updating row, same pattern
already used for the thinking_tokens counter.
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