§7.1 now says where its table lives in code, how the UI thread is
marked and guarded, and that the counts are a budget rather than a
bound until work is pooled by executor. The register's status note says
what is met — named, spawned through one module, block_on guarded and
tested — and what is not: pooling, a guard for synchronous file reads
and catalog queries, the two mask workers, and threads the core crates
start.
dtourolle
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