docs(soma): paridad de README del item 0 - data-ready en Indicator de tabs y SelectionIndicator de radio-group (fila de parte que faltaba incluida); hallazgo del corpus P0-docs (vicen-41)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/uix/soma/components/radio-group/README.md

@@ -30,6 +30,7 @@ visual recipe.
 | `Label`       | `<div>`    | Optional group label; registers `aria-labelledby` on root.   |
 | `Item`        | `<button>` | `role="radio"` item with roving tabindex and arrow handling. |
 | `Indicator`   | `<span>`   | Optional checked marker inside an item.                      |
+| `SelectionIndicator` | `<span>` | Group-level sliding pill for the `segmented` variant; soma positions it (`MeasuredIndicator`), eidos shapes it. |
 | `HiddenInput` | `<input>`  | Optional form input for `name` + selected item value.        |
 
 ## Field Integration
@@ -76,6 +77,8 @@ When rendered inside `Field`, the group OR-merges `disabled`, `readonly`,
 | Item     | `data-orientation`      | `horizontal` \| `vertical` |
 | Indicator| `data-radio-group-indicator` | Always present        |
 | Indicator| `data-state`            | `checked` \| `unchecked`   |
+| SelectionIndicator | `data-radio-group-selection-indicator` | Always present |
+| SelectionIndicator | `data-ready`  | Present once the first measure lands (anti-flash gate `lib/sliding-indicator.css` fades in on) |
 
 ## Keyboard
 

src/uix/soma/components/tabs/README.md

@@ -65,6 +65,7 @@ Triggers and content panels are associated by matching `value` strings, not by n
 | Content  | `data-ending-style`   | Present during close animation          |
 | Indicator| `data-tabs-indicator` | Always present                          |
 | Indicator| `data-orientation`    | `horizontal` \| `vertical`              |
+| Indicator| `data-ready`          | Present once the first measure lands (anti-flash gate the recipe fades in on) |
 
 ## Keyboard