refactor(list): flatten nested parallelism to single Rayon pool #482
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Replace nested parallelism (Rayon par_iter → thread::scope per worktree) with a flat Rayon-only approach. Previously, with 8 worktrees × 13 tasks, we could spawn ~104 OS threads. Now all tasks go into Rayon's fixed-size pool. Changes: - Add WorkItem struct and dispatch_task() to replace TaskSpawner - Generate all work items upfront, sort by is_network() so local git ops run before network I/O (CI status, URL health checks) - Execute flattened work items via single into_par_iter() - Configure global thread pool to 2× CPU cores for mixed I/O workloads - Delete TaskSpawner and collect_*_progressive functions The sorting ensures we're not waiting on slow network requests while local git operations could be running. Co-Authored-By: Claude <[email protected]>
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Summary
Test plan
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