Fix eSLIM crashes from non-contiguous delay selectors and unstrashed Gia export. - #536
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Fix &eslim -D 2 abort in DelayEngine::reduceDelay: delay-selector keys (arrival + remaining + d) are not contiguous, so callers such as AreaDelayMinimizer (replacement_delay - 1) can request a value that is not present in delay_selectors. Replaced the exact find() assert with lower_bound (map ordered by std::greater) so iteration starts at the largest representable delay ≤ initial_delay.
Fix &eslim -D 0 / -D 3 aborts in Aig_ManDupDfs / Aig_ManDfs during inprocessing: eSLIMCirManToGia() returned an unstrashed Gia. After Gia_ManToAig, ANDs that hash to constants/existing nodes become unreachable from COs, violating DFS node-count assumptions used by DeepSyn/&dch. Rehash with Gia_ManRehash before returning the Gia.