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+# MalioRadioGroup Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Introduce a `MalioRadioGroup` parent component that owns the value, shared `name`, and a single field message (with reserved space, like `MalioSelect`), so a radio group aligns visually with a select; turn `MalioRadioButton` into a group-aware input.
+
+**Architecture:** Mirror the existing `Accordion`/`AccordionItem` precedent — a `context.ts` injection key, the group `provide`s context, the radio `inject`s it. In a group, the radio inherits `name`/checked/error-styling/disabled and renders no message; standalone radios are unchanged. The group's message markup is copied verbatim from `Select.vue` so the two align automatically.
+
+**Tech Stack:** Nuxt 4 layer, Vue 3 `<script setup lang="ts">`, Tailwind (palette `m-*`), `tailwind-merge`, Vitest + `@vue/test-utils` (jsdom).
+
+## Global Constraints
+
+- `defineOptions({ name: 'MalioXxx', inheritAttrs: false })` at top of every component.
+- Classes merged with `twMerge()`; expose `*Class` props for consumer overrides.
+- Accessibility: `role="radiogroup"`, `aria-labelledby`, `aria-invalid`, `aria-describedby`, labels tied by `for`/`id`.
+- Components live in `app/components/malio/<dir>/` (auto-imported as `<MalioXxx>`).
+- Tests colocated as `ComponentName.test.ts`; helper `mount(...)` per existing patterns.
+- Conventional Commits. The pre-commit hook is flaky (intermittent test timeouts) — if a commit fails on a hook timeout unrelated to your change, retry; if it persists, commit with `--no-verify` and note it.
+- Branch: `feature/radio-group` (already created and checked out).
+- Stage files explicitly (never `git add -A`); never stage `nuxt.config.ts`.
+
+---
+
+### Task 1: `context.ts` + group-aware `RadioButton`
+
+**Files:**
+- Create: `app/components/malio/radio/context.ts`
+- Modify: `app/components/malio/radio/RadioButton.vue` (full replacement of script + template + style below)
+- Test: `app/components/malio/radio/RadioButton.test.ts` (add group tests; existing tests must stay green)
+
+**Interfaces:**
+- Produces `context.ts`:
+  - `type RadioValue = string | number | boolean | null | undefined`
+  - `interface RadioGroupContext { name: ComputedRef<string>; isSelected: (v: RadioValue) => boolean; select: (v: RadioValue) => void; hasError: ComputedRef<boolean>; hasSuccess: ComputedRef<boolean>; disabled: ComputedRef<boolean>; readonly: ComputedRef<boolean>; required: ComputedRef<boolean>; describedBy: ComputedRef<string | undefined> }`
+  - `const radioGroupContextKey: InjectionKey<RadioGroupContext>`
+- Produces (RadioButton): when a `RadioGroupContext` is injected, the radio uses `ctx.name`, `ctx.isSelected(value)`, `ctx.hasError/hasSuccess/disabled/readonly/required`, `ctx.describedBy`, and calls `ctx.select(value)` on change; it renders **no** `.radio-message`.
+- Consumed by Task 2 (`RadioGroup.vue` provides this context).
+
+- [ ] **Step 1: Write the failing test (group behavior)**
+
+Append to `app/components/malio/radio/RadioButton.test.ts`:
+
+```ts
+import {computed, ref} from 'vue'
+import {vi} from 'vitest'
+import {radioGroupContextKey, type RadioGroupContext, type RadioValue} from './context'
+
+const makeGroupCtx = (over: Partial<{
+  selected: RadioValue; error: boolean; success: boolean
+  disabled: boolean; readonly: boolean; required: boolean
+}> = {}) => {
+  const selected = ref<RadioValue>(over.selected ?? null)
+  const select = vi.fn((v: RadioValue) => { selected.value = v })
+  const ctx: RadioGroupContext = {
+    name: computed(() => 'grp'),
+    isSelected: (v) => selected.value === v,
+    select,
+    hasError: computed(() => !!over.error),
+    hasSuccess: computed(() => !!over.success),
+    disabled: computed(() => !!over.disabled),
+    readonly: computed(() => !!over.readonly),
+    required: computed(() => !!over.required),
+    describedBy: computed(() => 'grp-describedby'),
+  }
+  return {ctx, select, selected}
+}
+
+const mountInGroup = (props: RadioButtonProps, ctx: RadioGroupContext) =>
+  mount(RadioButtonForTest, {
+    props,
+    global: {provide: {[radioGroupContextKey as symbol]: ctx}},
+  })
+
+describe('MalioRadioButton dans un groupe', () => {
+  it('hérite du name du groupe', () => {
+    const {ctx} = makeGroupCtx()
+    const wrapper = mountInGroup({value: 'a', label: 'A'}, ctx)
+    expect(wrapper.get('input').attributes('name')).toBe('grp')
+  })
+
+  it('coché selon isSelected du groupe', () => {
+    const {ctx} = makeGroupCtx({selected: 'a'})
+    const wrapper = mountInGroup({value: 'a', label: 'A'}, ctx)
+    expect((wrapper.get('input').element as HTMLInputElement).checked).toBe(true)
+  })
+
+  it('appelle ctx.select au change au lieu d\'émettre', async () => {
+    const {ctx, select} = makeGroupCtx()
+    const wrapper = mountInGroup({value: 'b', label: 'B'}, ctx)
+    await wrapper.get('input').trigger('change')
+    expect(select).toHaveBeenCalledWith('b')
+    expect(wrapper.emitted('update:modelValue')).toBeUndefined()
+  })
+
+  it('reflète l\'erreur du groupe et ne rend aucun message propre', () => {
+    const {ctx} = makeGroupCtx({error: true})
+    const wrapper = mountInGroup({value: 'a', label: 'A', hint: 'ignoré'}, ctx)
+    expect(wrapper.get('.radio-control').classes()).toContain('is-error')
+    expect(wrapper.get('input').attributes('aria-invalid')).toBe('true')
+    expect(wrapper.find('.radio-message').exists()).toBe(false)
+    expect(wrapper.get('input').attributes('aria-describedby')).toBe('grp-describedby')
+  })
+
+  it('hérite de disabled/required du groupe', () => {
+    const {ctx} = makeGroupCtx({disabled: true, required: true})
+    const wrapper = mountInGroup({value: 'a', label: 'A'}, ctx)
+    expect(wrapper.get('input').attributes('disabled')).toBeDefined()
+    expect(wrapper.get('input').attributes('required')).toBeDefined()
+  })
+})
+```
+
+- [ ] **Step 2: Run the new tests to verify they fail**
+
+Run: `npm run test -- RadioButton`
+Expected: FAIL — `./context` cannot be resolved (module missing).
+
+- [ ] **Step 3: Create `context.ts`**
+
+`app/components/malio/radio/context.ts`:
+
+```ts
+import type {ComputedRef, InjectionKey} from 'vue'
+
+export type RadioValue = string | number | boolean | null | undefined
+
+export interface RadioGroupContext {
+  name: ComputedRef<string>
+  isSelected: (value: RadioValue) => boolean
+  select: (value: RadioValue) => void
+  hasError: ComputedRef<boolean>
+  hasSuccess: ComputedRef<boolean>
+  disabled: ComputedRef<boolean>
+  readonly: ComputedRef<boolean>
+  required: ComputedRef<boolean>
+  describedBy: ComputedRef<string | undefined>
+}
+
+export const radioGroupContextKey: InjectionKey<RadioGroupContext> = Symbol('MalioRadioGroup')
+```
+
+- [ ] **Step 4: Replace `RadioButton.vue` with the group-aware version**
+
+`app/components/malio/radio/RadioButton.vue` (full file):
+
+```vue
+<template>
+  <div :class="mergedGroupClass">
+    <div :class="mergedControlClass">
+      <label :for="inputId" :class="indicatorClass">
+        <input
+          :id="inputId"
+          :name="resolvedName"
+          :value="value"
+          :checked="isChecked"
+          :required="resolvedRequired"
+          :disabled="resolvedDisabled"
+          :aria-invalid="hasError"
+          :aria-describedby="describedBy"
+          :class="mergedInputClass"
+          v-bind="attrs"
+          type="radio"
+          @click="onClick"
+          @change="onChange"
+        >
+        <span class="radio-dot pointer-events-none absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 text-black opacity-0">
+          <svg viewBox="0 0 16 16" fill="currentColor" class="h-[10px]">
+            <circle cx="8" cy="8" r="8" />
+          </svg>
+        </span>
+      </label>
+
+      <label
+        v-if="label"
+        :for="inputId"
+        :class="mergedLabelClass"
+      >
+        {{ label }}<MalioRequiredMark v-if="resolvedRequired" />
+      </label>
+    </div>
+
+    <p
+      v-if="shouldShowMessage"
+      :id="`${inputId}-describedby`"
+      :class="mergedMessageClass"
+    >
+      {{ error || success || hint }}
+    </p>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {computed, inject, ref, useAttrs, useId} from 'vue'
+import {twMerge} from 'tailwind-merge'
+import MalioRequiredMark from '../shared/RequiredMark.vue'
+import {radioGroupContextKey, type RadioValue} from './context'
+
+defineOptions({name: 'MalioRadioButton', inheritAttrs: false})
+
+const props = withDefaults(
+  defineProps<{
+    id?: string
+    label?: string
+    name?: string
+    modelValue?: RadioValue
+    value?: RadioValue
+    inputClass?: string
+    labelClass?: string
+    groupClass?: string
+    required?: boolean
+    disabled?: boolean
+    readonly?: boolean
+    hint?: string
+    error?: string
+    success?: string
+  }>(),
+  {
+    id: '',
+    label: '',
+    name: '',
+    modelValue: undefined,
+    value: undefined,
+    inputClass: '',
+    labelClass: '',
+    groupClass: '',
+    required: false,
+    disabled: false,
+    readonly: false,
+    hint: '',
+    error: '',
+    success: '',
+  },
+)
+
+const attrs = useAttrs()
+const generatedId = useId()
+const localValue = ref<RadioValue>(undefined)
+const group = inject(radioGroupContextKey, null)
+
+const inputId = computed(() => props.id?.toString() || `malio-radio-${generatedId}`)
+const isControlled = computed(() => props.modelValue !== undefined)
+
+const resolvedName = computed(() => (group ? group.name.value : props.name))
+const resolvedDisabled = computed(() => props.disabled || (group?.disabled.value ?? false))
+const resolvedReadonly = computed(() => props.readonly || (group?.readonly.value ?? false))
+const resolvedRequired = computed(() => props.required || (group?.required.value ?? false))
+
+const isChecked = computed(() => {
+  if (group) return group.isSelected(props.value)
+  return isControlled.value ? props.modelValue === props.value : localValue.value === props.value
+})
+
+const hasError = computed(() => (group ? group.hasError.value : !!props.error))
+const hasSuccess = computed(() =>
+  group ? group.hasSuccess.value : !!props.success && !hasError.value,
+)
+
+const shouldShowMessage = computed(
+  () => !group && !!(props.hint || hasError.value || hasSuccess.value),
+)
+
+const describedBy = computed(() => {
+  if (group) return group.describedBy.value
+  if (!shouldShowMessage.value) return undefined
+  return `${inputId.value}-describedby`
+})
+
+const mergedGroupClass = computed(() =>
+  twMerge(group ? 'radio-item w-auto' : 'radio-item mt-4 w-full', props.groupClass),
+)
+
+const indicatorClass = computed(() =>
+  twMerge(
+    'radio-indicator relative flex cursor-pointer items-center',
+    group ? 'px-3 py-2.5' : 'p-3',
+  ),
+)
+
+const mergedControlClass = computed(() =>
+  twMerge(
+    'radio-control flex items-center',
+    hasError.value ? 'is-error' : '',
+    hasSuccess.value ? 'is-success' : '',
+    resolvedDisabled.value ? 'is-disabled' : '',
+  ),
+)
+
+const mergedInputClass = computed(() =>
+  twMerge(
+    'h-5 w-5 cursor-pointer appearance-none rounded-full border-2 border-m-muted checked:border-black',
+    props.inputClass,
+  ),
+)
+
+const mergedLabelClass = computed(() =>
+  twMerge(
+    'radio-text mt-px cursor-pointer',
+    isChecked.value ? 'text-black' : 'text-m-muted',
+    hasError.value ? 'text-m-danger' : '',
+    hasSuccess.value ? 'text-m-success' : '',
+    resolvedDisabled.value ? 'cursor-not-allowed text-black/60' : '',
+    props.labelClass,
+  ),
+)
+
+const mergedMessageClass = computed(() =>
+  twMerge(
+    'radio-message ml-3 -mt-1 text-xs',
+    hasError.value
+      ? 'text-m-danger'
+      : hasSuccess.value
+        ? 'text-m-success'
+        : 'text-m-muted',
+  ),
+)
+
+const emit = defineEmits<{
+  (event: 'update:modelValue', value: RadioValue): void
+}>()
+
+const onClick = (event: MouseEvent) => {
+  if (!resolvedReadonly.value) return
+
+  event.preventDefault()
+}
+
+const onChange = (event: Event) => {
+  if (resolvedReadonly.value) {
+    const target = event.target as HTMLInputElement
+    target.checked = isChecked.value
+    return
+  }
+
+  if (group) {
+    group.select(props.value)
+    return
+  }
+
+  if (!isControlled.value) {
+    localValue.value = props.value
+  }
+
+  emit('update:modelValue', props.value)
+}
+</script>
+
+<style scoped>
+.radio-control input[type='radio']:checked + .radio-dot {
+  opacity: 1;
+}
+
+.radio-control input[type='radio']:focus-visible {
+  outline: 2px solid rgb(var(--m-primary) / 1);
+  outline-offset: 2px;
+}
+
+.radio-control.is-error input[type='radio'] {
+  border-color: rgb(var(--m-danger) / 1);
+}
+
+.radio-control.is-error .radio-dot {
+  color: rgb(var(--m-danger) / 1);
+}
+
+.radio-control.is-success input[type='radio'] {
+  border-color: rgb(var(--m-success) / 1);
+}
+
+.radio-control.is-success .radio-dot {
+  color: rgb(var(--m-success) / 1);
+}
+
+.radio-control.is-disabled .radio-indicator,
+.radio-control.is-disabled .radio-text {
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+</style>
+```
+
+Note: the old `.radio-item:has(+ .radio-item) .radio-message { display: none }` rule is intentionally removed — the group now owns the single message.
+
+- [ ] **Step 5: Run RadioButton tests (new + existing regression)**
+
+Run: `npm run test -- RadioButton`
+Expected: PASS — all existing standalone tests plus the new "dans un groupe" suite.
+(If a flaky timeout occurs, re-run once.)
+
+- [ ] **Step 6: Lint**
+
+Run: `npm run lint -- app/components/malio/radio`
+Expected: no errors.
+
+- [ ] **Step 7: Commit**
+
+```bash
+git add app/components/malio/radio/context.ts app/components/malio/radio/RadioButton.vue app/components/malio/radio/RadioButton.test.ts
+git commit -m "feat(radio): contexte de groupe injectable pour RadioButton"
+```
+
+---
+
+### Task 2: `RadioGroup.vue`
+
+**Files:**
+- Create: `app/components/malio/radio/RadioGroup.vue`
+- Test: `app/components/malio/radio/RadioGroup.test.ts`
+
+**Interfaces:**
+- Consumes `radioGroupContextKey`, `RadioValue` from `./context` (Task 1) and `MalioRadioButton` (Task 1).
+- Produces `<MalioRadioGroup>` with props: `modelValue?: RadioValue`, `options?: {label: string; value: RadioValue; disabled?: boolean}[]`, `label?: string`, `name?: string`, `inline?: boolean`, `disabled?/readonly?/required?: boolean`, `hint?/error?/success?: string`, `reserveMessageSpace?: boolean` (default `true`), `groupClass?/inputClass?/labelClass?: string`. Emits `update:modelValue(value: RadioValue)`. Default slot renders extra `<MalioRadioButton>`s.
+
+- [ ] **Step 1: Write the failing test**
+
+`app/components/malio/radio/RadioGroup.test.ts`:
+
+```ts
+import {describe, expect, it} from 'vitest'
+import {mount} from '@vue/test-utils'
+import type {DefineComponent} from 'vue'
+import RadioGroup from './RadioGroup.vue'
+import RadioButton from './RadioButton.vue'
+
+type Opt = {label: string; value: string; disabled?: boolean}
+type RadioGroupProps = {
+  modelValue?: string | number | boolean | null
+  options?: Opt[]
+  label?: string
+  name?: string
+  inline?: boolean
+  disabled?: boolean
+  readonly?: boolean
+  required?: boolean
+  hint?: string
+  error?: string
+  success?: string
+  reserveMessageSpace?: boolean
+  groupClass?: string
+  inputClass?: string
+  labelClass?: string
+}
+
+const RadioGroupForTest = RadioGroup as DefineComponent<RadioGroupProps>
+
+const options: Opt[] = [
+  {label: 'Oui', value: 'oui'},
+  {label: 'Non', value: 'non'},
+]
+
+const mountGroup = (props: RadioGroupProps = {}) =>
+  mount(RadioGroupForTest, {props: {options, ...props}})
+
+describe('MalioRadioGroup', () => {
+  it('rend une option par entrée et un seul role=radiogroup', () => {
+    const wrapper = mountGroup()
+    expect(wrapper.findAll('input[type="radio"]')).toHaveLength(2)
+    expect(wrapper.findAll('[role="radiogroup"]')).toHaveLength(1)
+  })
+
+  it('partage le même name natif entre les radios', () => {
+    const wrapper = mountGroup({name: 'prestation'})
+    const names = wrapper.findAll('input').map(i => i.attributes('name'))
+    expect(names).toEqual(['prestation', 'prestation'])
+  })
+
+  it('coche selon modelValue', () => {
+    const wrapper = mountGroup({modelValue: 'non'})
+    const inputs = wrapper.findAll('input')
+    expect((inputs[1].element as HTMLInputElement).checked).toBe(true)
+    expect((inputs[0].element as HTMLInputElement).checked).toBe(false)
+  })
+
+  it('émet update:modelValue au clic sur une option', async () => {
+    const wrapper = mountGroup()
+    await wrapper.findAll('input')[1].trigger('change')
+    expect(wrapper.emitted('update:modelValue')?.[0]).toEqual(['non'])
+  })
+
+  it('affiche UN seul message d\'erreur réservant l\'espace', () => {
+    const wrapper = mountGroup({error: 'Sélection requise'})
+    const msgs = wrapper.findAll('[id$="-describedby"]')
+    expect(msgs).toHaveLength(1)
+    expect(msgs[0].text()).toBe('Sélection requise')
+    expect(msgs[0].classes()).toContain('min-h-[1rem]')
+    expect(msgs[0].classes()).toContain('text-m-danger')
+    expect(wrapper.find('.radio-message').exists()).toBe(false)
+  })
+
+  it('propage l\'erreur aux radios enfants', () => {
+    const wrapper = mountGroup({error: 'Sélection requise'})
+    expect(wrapper.findAll('.radio-control.is-error')).toHaveLength(2)
+    expect(wrapper.findAll('input').every(i => i.attributes('aria-invalid') === 'true')).toBe(true)
+  })
+
+  it('reserveMessageSpace=false sans message : aucune ligne réservée', () => {
+    const wrapper = mountGroup({reserveMessageSpace: false})
+    expect(wrapper.find('[id$="-describedby"]').exists()).toBe(false)
+  })
+
+  it('rend la legend et la lie via aria-labelledby', () => {
+    const wrapper = mountGroup({label: 'Prestation'})
+    const legendId = wrapper.find('[id$="-label"]').attributes('id')
+    expect(wrapper.get('[id$="-label"]').text()).toContain('Prestation')
+    expect(wrapper.get('[role="radiogroup"]').attributes('aria-labelledby')).toBe(legendId)
+  })
+
+  it('inline : la zone radios réserve la hauteur d\'un champ', () => {
+    const wrapper = mountGroup({inline: true})
+    expect(wrapper.get('[role="radiogroup"]').classes()).toContain('min-h-[2.5rem]')
+  })
+
+  it('accepte des radios via le slot par défaut', () => {
+    const wrapper = mount(RadioGroupForTest, {
+      props: {modelValue: 'b'},
+      slots: {
+        default: () => [
+          h(RadioButton, {value: 'a', label: 'A'}),
+          h(RadioButton, {value: 'b', label: 'B'}),
+        ],
+      },
+    })
+    expect(wrapper.findAll('input')).toHaveLength(2)
+    expect((wrapper.findAll('input')[1].element as HTMLInputElement).checked).toBe(true)
+  })
+})
+```
+
+Add `import {h} from 'vue'` at the top of the test file (used by the slot test).
+
+- [ ] **Step 2: Run the test to verify it fails**
+
+Run: `npm run test -- RadioGroup`
+Expected: FAIL — cannot resolve `./RadioGroup.vue`.
+
+- [ ] **Step 3: Create `RadioGroup.vue`**
+
+`app/components/malio/radio/RadioGroup.vue`:
+
+```vue
+<template>
+  <div :class="mergedGroupClass">
+    <span
+      v-if="label"
+      :id="`${groupId}-label`"
+      :class="mergedLabelClass"
+    >
+      {{ label }}<MalioRequiredMark v-if="required" />
+    </span>
+
+    <div
+      role="radiogroup"
+      :aria-labelledby="label ? `${groupId}-label` : undefined"
+      :aria-invalid="hasError || undefined"
+      :aria-describedby="describedBy"
+      :class="contentClass"
+    >
+      <MalioRadioButton
+        v-for="(option, index) in options"
+        :key="`${groupId}-opt-${index}`"
+        :label="option.label"
+        :value="option.value"
+        :disabled="option.disabled"
+        :input-class="inputClass"
+      />
+      <slot />
+    </div>
+
+    <p
+      v-if="reserveMessageSpace || hint || error || success"
+      :id="`${groupId}-describedby`"
+      :class="[
+        hasError
+          ? 'text-m-danger'
+          : hasSuccess
+            ? 'text-m-success'
+            : 'text-m-muted',
+        'mt-1 ml-[2px] text-xs',
+        reserveMessageSpace ? 'min-h-[1rem]' : '',
+      ]"
+    >
+      {{ error || success || hint }}
+    </p>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {computed, provide, ref, useId} from 'vue'
+import {twMerge} from 'tailwind-merge'
+import MalioRadioButton from './RadioButton.vue'
+import MalioRequiredMark from '../shared/RequiredMark.vue'
+import {radioGroupContextKey, type RadioValue} from './context'
+
+defineOptions({name: 'MalioRadioGroup', inheritAttrs: false})
+
+interface RadioOption {
+  label: string
+  value: RadioValue
+  disabled?: boolean
+}
+
+const props = withDefaults(
+  defineProps<{
+    modelValue?: RadioValue
+    options?: RadioOption[]
+    label?: string
+    name?: string
+    inline?: boolean
+    disabled?: boolean
+    readonly?: boolean
+    required?: boolean
+    hint?: string
+    error?: string
+    success?: string
+    reserveMessageSpace?: boolean
+    groupClass?: string
+    inputClass?: string
+    labelClass?: string
+  }>(),
+  {
+    modelValue: undefined,
+    options: () => [],
+    label: '',
+    name: '',
+    inline: false,
+    disabled: false,
+    readonly: false,
+    required: false,
+    hint: '',
+    error: '',
+    success: '',
+    reserveMessageSpace: true,
+    groupClass: '',
+    inputClass: '',
+    labelClass: '',
+  },
+)
+
+const emit = defineEmits<{
+  (event: 'update:modelValue', value: RadioValue): void
+}>()
+
+const generatedId = useId()
+const groupId = computed(() => props.name || `malio-radio-group-${generatedId}`)
+
+const localValue = ref<RadioValue>(undefined)
+const isControlled = computed(() => props.modelValue !== undefined)
+const selectedValue = computed(() =>
+  isControlled.value ? props.modelValue : localValue.value,
+)
+
+const hasError = computed(() => !!props.error)
+const hasSuccess = computed(() => !!props.success && !hasError.value)
+const shouldShowMessage = computed(() => !!(props.hint || hasError.value || hasSuccess.value))
+const describedBy = computed(() =>
+  props.reserveMessageSpace || shouldShowMessage.value
+    ? `${groupId.value}-describedby`
+    : undefined,
+)
+
+const select = (value: RadioValue) => {
+  if (props.readonly || props.disabled) return
+  if (!isControlled.value) localValue.value = value
+  emit('update:modelValue', value)
+}
+
+provide(radioGroupContextKey, {
+  name: computed(() => groupId.value),
+  isSelected: (value: RadioValue) => selectedValue.value === value,
+  select,
+  hasError,
+  hasSuccess,
+  disabled: computed(() => props.disabled),
+  readonly: computed(() => props.readonly),
+  required: computed(() => props.required),
+  describedBy,
+})
+
+const contentClass = computed(() =>
+  props.inline
+    ? 'flex flex-wrap items-center gap-x-6 min-h-[2.5rem]'
+    : 'flex flex-col gap-y-1',
+)
+
+const mergedGroupClass = computed(() => twMerge('w-full', props.groupClass))
+
+const mergedLabelClass = computed(() =>
+  twMerge(
+    'mb-1 block text-sm text-m-text',
+    hasError.value ? 'text-m-danger' : '',
+    props.labelClass,
+  ),
+)
+</script>
+```
+
+- [ ] **Step 4: Run the test to verify it passes**
+
+Run: `npm run test -- RadioGroup`
+Expected: PASS — all `MalioRadioGroup` tests.
+
+- [ ] **Step 5: Lint**
+
+Run: `npm run lint -- app/components/malio/radio`
+Expected: no errors.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add app/components/malio/radio/RadioGroup.vue app/components/malio/radio/RadioGroup.test.ts
+git commit -m "feat(radio): composant MalioRadioGroup (message unique, reserveMessageSpace)"
+```
+
+---
+
+### Task 3: Histoire story + playground page + nav
+
+**Files:**
+- Create: `app/story/radio/RadioGroup.story.vue`
+- Create: `.playground/pages/composant/radio/radioGroup.vue`
+- Modify: `.playground/playground.nav.ts` (add nav entry under "SÉLECTIONS")
+
+**Interfaces:**
+- Consumes `<MalioRadioGroup>` (Task 2, auto-imported in story/playground).
+
+- [ ] **Step 1: Create the Histoire story**
+
+`app/story/radio/RadioGroup.story.vue`:
+
+```vue
+<template>
+  <Story title="Input/RadioGroup">
+    <div class="grid grid-cols-1 gap-6 md:grid-cols-2">
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Empilé</h2>
+        <MalioRadioGroup v-model="stacked" :options="options" label="Catégorie" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">En ligne</h2>
+        <MalioRadioGroup v-model="inline" :options="yesNo" inline label="Prestation" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Erreur</h2>
+        <MalioRadioGroup v-model="errored" :options="yesNo" inline error="Sélection requise" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Succès</h2>
+        <MalioRadioGroup v-model="ok" :options="yesNo" inline success="Enregistré" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Désactivé</h2>
+        <MalioRadioGroup v-model="disabled" :options="options" disabled label="Catégorie" />
+      </div>
+
+      <div class="rounded-lg border p-4">
+        <h2 class="mb-4 text-xl font-bold">Requis + slot</h2>
+        <MalioRadioGroup v-model="slotted" required label="Civilité" inline>
+          <MalioRadioButton value="M" label="Monsieur" />
+          <MalioRadioButton value="Mme" label="Madame" />
+        </MalioRadioGroup>
+      </div>
+    </div>
+  </Story>
+</template>
+
+<script setup lang="ts">
+import {ref} from 'vue'
+
+const options = [
+  {label: 'Catégorie 1', value: 'cat1'},
+  {label: 'Catégorie 2', value: 'cat2'},
+  {label: 'Catégorie 3', value: 'cat3'},
+]
+const yesNo = [
+  {label: 'Oui', value: 'oui'},
+  {label: 'Non', value: 'non'},
+]
+
+const stacked = ref<string | null>(null)
+const inline = ref<string | null>('oui')
+const errored = ref<string | null>(null)
+const ok = ref<string | null>('oui')
+const disabled = ref<string | null>('cat2')
+const slotted = ref<string | null>(null)
+</script>
+```
+
+- [ ] **Step 2: Create the playground page**
+
+`.playground/pages/composant/radio/radioGroup.vue`:
+
+```vue
+<template>
+  <div class="space-y-8 p-8">
+    <section>
+      <h2 class="mb-4 text-xl font-bold">Aligné avec un select (en ligne, erreur)</h2>
+      <div class="grid grid-cols-3 gap-x-[80px] gap-y-5">
+        <MalioRadioGroup v-model="prestation" :options="yesNo" inline error="Sélection requise" />
+        <MalioSelect
+          v-model="fournisseur"
+          label="Fournisseur"
+          error="Sélection requise"
+          :options="[
+            {label: 'Fournisseur 1', value: 'Fournisseur 1'},
+            {label: 'Fournisseur 2', value: 'Fournisseur 2'},
+          ]"
+        />
+      </div>
+    </section>
+
+    <section>
+      <h2 class="mb-4 text-xl font-bold">Empilé avec label</h2>
+      <MalioRadioGroup v-model="categorie" :options="categories" label="Catégorie" />
+    </section>
+
+    <section>
+      <h2 class="mb-4 text-xl font-bold">Slot custom + requis</h2>
+      <MalioRadioGroup v-model="civilite" inline required label="Civilité">
+        <MalioRadioButton value="M" label="Monsieur" />
+        <MalioRadioButton value="Mme" label="Madame" />
+      </MalioRadioGroup>
+    </section>
+  </div>
+</template>
+
+<script setup lang="ts">
+import {ref} from 'vue'
+
+const yesNo = [
+  {label: 'Oui', value: 'oui'},
+  {label: 'Non', value: 'non'},
+]
+const categories = [
+  {label: 'Catégorie 1', value: 'cat1'},
+  {label: 'Catégorie 2', value: 'cat2'},
+]
+
+const prestation = ref<string | null>(null)
+const fournisseur = ref<string>('')
+const categorie = ref<string | null>(null)
+const civilite = ref<string | null>(null)
+</script>
+```
+
+- [ ] **Step 3: Add the nav entry**
+
+In `.playground/playground.nav.ts`, inside the "SÉLECTIONS" group's `items`, add immediately after the `Radio` entry:
+
+```ts
+      {label: 'Radio', to: '/composant/radio/radioButton'},
+      {label: 'Radio (groupe)', to: '/composant/radio/radioGroup'},
+```
+
+- [ ] **Step 4: Lint**
+
+Run: `npm run lint -- .playground/pages/composant/radio app/story/radio`
+Expected: no new errors on the created files (pre-existing warnings elsewhere are fine).
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add app/story/radio/RadioGroup.story.vue .playground/pages/composant/radio/radioGroup.vue .playground/playground.nav.ts
+git commit -m "docs(radio): story + page playground MalioRadioGroup"
+```
+
+---
+
+### Task 4: Use `MalioRadioGroup` in the client form (revert the hack)
+
+**Files:**
+- Modify: `.playground/pages/composant/form/client.vue`
+
+**Interfaces:**
+- Consumes `<MalioRadioGroup>` (Task 2).
+
+- [ ] **Step 1: Replace the manual radio block**
+
+In `.playground/pages/composant/form/client.vue`, replace the whole `<div class="prestation-field …">…</div>` block (the radios wrapper + manual `<p>`) with:
+
+```html
+        <MalioRadioGroup
+          v-model="prestationChoice"
+          :options="prestationOptions"
+          inline
+          error="Sélection requise"
+        />
+```
+
+- [ ] **Step 2: Remove the now-unused import and style**
+
+- Delete the line `import MalioRadioButton from "../../../../app/components/malio/radio/RadioButton.vue";` (no longer referenced — `MalioRadioGroup` is auto-imported).
+- Delete the entire `<style scoped> … .prestation-field :deep(.radio-message) … </style>` block at the end of the file.
+- Keep `prestationChoice` and `prestationOptions` refs as-is.
+
+- [ ] **Step 3: Lint**
+
+Run: `npm run lint -- .playground/pages/composant/form/client.vue`
+Expected: no new errors from this change.
+
+- [ ] **Step 4: Visual verification in the browser**
+
+Start a clean dev server on a dedicated port and confirm alignment (the original bug):
+
+```bash
+PORT=3010 npm run dev
+```
+
+Navigate to `http://localhost:3010/composant/form/client`. Using Chrome MCP `evaluate_script`, assert that on the "Prestation de triage" row:
+- the radio circles' vertical center ≈ the `Fournisseur` select box vertical center (±2px);
+- the radio group message top ≈ the `Fournisseur` error message top (±2px).
+
+Expected: both differences within 2px (was ~10px circle offset / ~6px message offset before).
+
+> Per project convention, do not open the browser MCP without the user's go-ahead — propose this verification step and wait for approval, or let the user run it. Tests + lint are the primary gate.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add .playground/pages/composant/form/client.vue
+git commit -m "feat(playground): formulaire client utilise MalioRadioGroup"
+```
+
+---
+
+### Task 5: Documentation (`COMPONENTS.md` + `CHANGELOG.md`)
+
+**Files:**
+- Modify: `COMPONENTS.md` (add a `## MalioRadioGroup` section after the `MalioRadioButton` section, ending line ~500)
+- Modify: `CHANGELOG.md` (add an `Added` entry)
+
+- [ ] **Step 1: Add the `MalioRadioGroup` section to `COMPONENTS.md`**
+
+Insert immediately after the `MalioRadioButton` section's closing `---` (currently line 500), before `## MalioDate`:
+
+```markdown
+## MalioRadioGroup
+
+Groupe de boutons radio : possède la valeur, le `name` partagé et **un seul** message (erreur/succès/aide) avec espace réservé comme les autres champs — un groupe en ligne s'aligne donc avec un `MalioSelect` voisin. Les options sont déclarées via `:options` ou via le slot par défaut (`<MalioRadioButton>`).
+
+| Prop | Type | Défaut | Description |
+|------|------|--------|-------------|
+| `modelValue` | `string \| number \| boolean \| null` | `undefined` | Valeur sélectionnée (v-model) |
+| `options` | `{label, value, disabled?}[]` | `[]` | Options déclaratives |
+| `label` | `string` | `''` | Label de groupe (legend, lié par `aria-labelledby`) |
+| `name` | `string` | auto | Nom natif partagé des radios |
+| `inline` | `boolean` | `false` | Disposition horizontale |
+| `disabled` | `boolean` | `false` | Désactive tout le groupe |
+| `readonly` | `boolean` | `false` | Lecture seule |
+| `required` | `boolean` | `false` | Champ requis (astérisque dans la legend) |
+| `hint` / `error` / `success` | `string` | `''` | Message unique du groupe |
+| `reserveMessageSpace` | `boolean` | `true` | Réserve la ligne de message (alignement) |
+| `groupClass` / `inputClass` / `labelClass` | `string` | `''` | Overrides `twMerge` |
+
+**Events :** `update:modelValue(value: string | number | boolean | null)`
+
+**Accessibilité :** conteneur `role="radiogroup"`, `aria-labelledby` (si `label`), `aria-invalid` et `aria-describedby` sur le message unique. Les radios enfants héritent de l'état d'erreur/désactivé du groupe.
+
+```vue
+<MalioRadioGroup
+  v-model="prestation"
+  :options="[{label: 'Oui', value: 'oui'}, {label: 'Non', value: 'non'}]"
+  inline
+  error="Sélection requise"
+/>
+
+<MalioRadioGroup v-model="civilite" label="Civilité" inline>
+  <MalioRadioButton value="M" label="Monsieur" />
+  <MalioRadioButton value="Mme" label="Madame" />
+</MalioRadioGroup>
+```
+
+---
+```
+
+- [ ] **Step 2: Add the `CHANGELOG.md` entry**
+
+Under `## [0.0.0]` → `### Added`, append a new bullet at the end of the list:
+
+```markdown
+* [#MUI-radio-group] Création d'un composant radio group (message unique, alignement select)
+```
+
+(If the team uses a real issue id, substitute it for `#MUI-radio-group`.)
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add COMPONENTS.md CHANGELOG.md
+git commit -m "docs(radio): documente MalioRadioGroup (COMPONENTS + CHANGELOG)"
+```
+
+---
+
+### Final verification
+
+- [ ] **Run the full radio suite + lint**
+
+Run: `npm run test -- radio` then `npm run lint`
+Expected: radio tests green; lint reports no new errors from the created/modified files.
+
+- [ ] **Confirm the branch is clean except intended files**
+
+Run: `git status`
+Expected: only intended changes committed; `nuxt.config.ts` remains unstaged/untouched.