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optimize.sx adds three result-preserving passes: dce (keep outputs + ancestors, preserve ids), cse (==build; structural sharing is free from content addressing), and fuse (collapse 1-to-1 fusible unary chains into an artdag/pipeline node fed by the chain head's input; leaves/fan-out/non-fusible ops never fuse). fusing-runner replays pipeline stages, output-equivalent to the unfused dag. optimize 18/18, total 87/87. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>