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…lve budget across lanes (#365) solve and solve_batch read the ambient pool width once and pass it down as Par. Right-hand sides run in lanes that halve the budget between them, each lane reusing one scratch; a stall builds the next rung once, isolated under the whole budget, and the stalled right-hand sides resume on it. The PrecondSlot enum becomes a base build plus a list of rungs, so the ladder is N rungs rather than a diagonal/Schwarz special case.
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Closes #365. Stacked on #486.
solve/solve_batchread the ambient pool width once and pass it down asPar.PrecondSlotbecomes a base build plus a list of rungs.thread_countchecks equal bits at 1/2/3/8 threads. Rust 502 passed, pytest 117 passed / 2 skipped.