006c990b

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Replace StmMap worker status tracking with a TVar Int busy counter

The allDone check materialized the entire status map into a list via
ListT.toList on every idle tick for every worker. Replace the StmMap Int
Bool with a single TVar Int counting busy workers, making the idle check
O(1) instead of O(n) in the number of fetchers.

Dependencies Timing

Agent Instructions

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