feat(core): field.control as a kind map with deep-merged arms (#155) - #156
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…rge (#155) Recipes can override one control arm without wiping select/textarea/choicegroup. Engine coerces maps at part lookup; intercept parts.control stays a function. Co-authored-by: Cursor <cursoragent@cursor.com>
This was referenced Aug 16, 2026
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Summary
Closes #155 (child of #141). Stacks on #152 / #146.
defaults.field.controlis a kind map (input/select/textarea/choicegroup) so a recipe can override one arm without wiping the others. Engine coerces maps at part lookup (ADR 052). Interceptparts.controlstays a function. RHF / TanStack recipes moved onto arms; native still just wrapsfield.root.Agent did the grind.
Test plan
mergeDefaults({ field: { control: { input } } })keeps native select / textarea / choicegroupuseFormTree({ defaults: { field: { control: { input } } } })shows the custom input and a native<select>parts.controlstill works (function, not a map)npm run gateMade with Cursor