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Bug on ENP-STEEL-BASIC (2026-05-20): authoring used the Tree Editor to build a recipe with a "Steel Line" sub_process holding 7 nested operations (Cleaner, Acid Dip, Nickel Strike, E-Nickel Plate, etc.). The Simple Editor's /fp/simple_recipe/load endpoint only walked `recipe.child_ids`, so it returned 10 steps. The work order generator (fp.job._generate_steps) walked the same tree depth-first and emitted 16 steps. Author and operator disagreed about what was in the recipe. Fix: new `_flatten_recipe_operations(recipe)` helper walks the tree depth-first, recurses into `recipe` and `sub_process`, emits each `operation` exactly once, skips `step` children (they're sub- instructions of operations). Mirrors the WO walker. Step payload now carries a `nested_under` string — the chained sub- process name(s) the operation lives inside (empty for top-level). The Simple Editor XML renders that as a small "↳ Steel Line" badge next to the step name so the author can see where each row came from in the tree. Deep nesting chains with ' › ' (e.g. "Outer › Inner"). `step` children of `recipe` itself remain invisible — they were silently skipped by the WO generator pre-19.0.18.8.0 anyway (only operation nodes spawn fp.job.step rows). Restoring them here would contradict that long-standing contract. Edit/insert/reorder/remove endpoints unchanged: editing a nested operation's name / description / tanks works (no parent change). Drag-reorder within sub-process siblings still works. Drag across sub-process boundaries isn't supported — opens the door for a Tree Editor follow-up if needed, but the immediate "I can't see my steps" complaint is resolved. ENP-STEEL-BASIC on entech now shows all 16 operations in the Simple Editor (was 10), with the 7 inside Steel Line tagged accordingly. Tests: 7 new (TestSimpleRecipeFlatten) — flat recipes still work, nested operations surface with correct path label, sub_process nodes never appear as editor rows, step children of operations stay hidden, deep-nested sub_processes chain path labels. Module: fusion_plating 19.0.20.2.0 → 19.0.20.3.0. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>