control-multimethod-conversion

Status: Backlog | Priority: P0 | Created: 2026-02-20 | Depends-on: dead-reference-cleanup

Summary

Convert control.cljc from map-based rendering dispatch (::rad/controls ::type->style->control) to multimethod-based dispatch, consistent with form_render.cljc and report_render.cljc.

Current State

control.cljc line 41-64: render-control does map-based lookup via ::rad/controls ::type->style->control. This is the only remaining map-based dispatch in the rendering system.

Target

Replace with a multimethod:

(defmulti render-control
  "Render a control element. Dispatches on [control-type style]."
  (fn [control-type style instance control-key]
    [control-type style])
  :hierarchy #'fr/render-hierarchy)

Changes

• control.cljc: Replace render-control function with defmulti
• Remove ::rad/controls runtime atom concept (no more install! of control maps)
• Keep pure functions: current-value, component-controls, standard-control-layout

Acceptance Criteria

• render-control is a multimethod dispatching on [control-type style]
• No remaining references to ::type->style->control, ::element->style->layout, or ::style->layout map-based dispatch
• Shares fr/render-hierarchy with form and report renderers