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Behavior-preserving code-quality cleanup across the Dify Builder engine: extract emit_canvas, build_change_set, mint_checkpoint, action_kind, and merge_known_keys into handlers_fix.py (shared by handlers_build.py and handlers_edit.py); extract _add in repository.py for the id-preservation idiom; extract _make_edge (and unify the node/edge id-collision loops into _next_unique_id) in graph_ops.py; extract _sync_graph_only in dify_port.py. No behavior, generated ids, or wire output changed — same 387-test suite passes, ruff clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>