refactor(ui-models): render the curated fields from a narrowed adapter family

The effort field's existence check was unreachable — EFFORT_FIELD is
total over the two known families — and a coverage exemption was papering
over the branch, which the merged toolchain no longer honored. Taking the
narrowed family as a parameter makes the lookup total at the type level,
so the check and its exemption both disappear. The rendered output is
unchanged: the browser goldens replay byte-identical.

packages/client/ui-models/src/client/ProviderEditor.tsx

@@ -199,23 +199,15 @@ export function ProviderEditor(props: ProviderEditorProps): ReactNode {
   }
 
   const keyLocked = keyState?.writable === false
-  const effortField = layout === 'unknown' ? undefined : EFFORT_FIELD[layout]
 
+  /**
+   * The curated fields of one known adapter family. Taking the narrowed
+   * family as a parameter is what makes `EFFORT_FIELD` total here: an
+   * unknown namespace never reaches this body.
+   */
+  const curatedFields = (family: 'deepseek' | 'pi-ai'): ReactNode => {
+    const effortField = EFFORT_FIELD[family]
     return (
-    <div className={styles['editor']}>
-      {props.hideTitle === true
-        ? null
-        : (
-          <div className={styles['editorHeader']}>
-            <span className={styles['editorTitle']}>{props.displayName}</span>
-            {props.provider !== props.displayName
-              ? <span className={styles['editorRoute']}>{props.provider}</span>
-              : null}
-          </div>
-        )}
-      {layout === 'unknown'
-        ? <p className={styles['advancedHint']}>{`${t('advancedHint')} (${namespace.ns})`}</p>
-        : (
       <>
         <div className={styles['field']}>
           <span className={styles['fieldLabel']}>{t('keyInput')}</span>
@@ -241,7 +233,7 @@ export function ProviderEditor(props: ProviderEditorProps): ReactNode {
                 className={styles['input']}
                 type="text"
                 value={stringAt(draft, 'baseURL') ?? ''}
-                    placeholder={layout === 'deepseek'
+                placeholder={family === 'deepseek'
                   ? DEEPSEEK_PUBLIC_BASE_URL
                   : stringAt(fallback, 'baseURL') ?? t('baseUrlDefault')}
                 aria-label={t('baseUrl')}
@@ -251,9 +243,6 @@ export function ProviderEditor(props: ProviderEditorProps): ReactNode {
                 }}
               />
             </div>
-                {/* v8 ignore next -- EFFORT_FIELD is total over non-unknown layouts; the check only narrows the type */}
-                {effortField !== undefined
-                  ? (
             <div className={styles['field']}>
               <span className={styles['fieldLabel']}>{t('effort')}</span>
               <select
@@ -266,17 +255,32 @@ export function ProviderEditor(props: ProviderEditorProps): ReactNode {
                 }}
               >
                 <option value="">{t('effortInherit')}</option>
-                        {EFFORT_CHOICES[layout].map(choice => (
+                {EFFORT_CHOICES[family].map(choice => (
                   <option key={choice} value={choice}>{choice}</option>
                 ))}
               </select>
             </div>
-                  )
-                  : null}
           </div>
         </details>
       </>
+    )
+  }
+
+  return (
+    <div className={styles['editor']}>
+      {props.hideTitle === true
+        ? null
+        : (
+          <div className={styles['editorHeader']}>
+            <span className={styles['editorTitle']}>{props.displayName}</span>
+            {props.provider !== props.displayName
+              ? <span className={styles['editorRoute']}>{props.provider}</span>
+              : null}
+          </div>
         )}
+      {layout === 'unknown'
+        ? <p className={styles['advancedHint']}>{`${t('advancedHint')} (${namespace.ns})`}</p>
+        : curatedFields(layout)}
       {failure !== undefined ? <p className={styles['error']}>{failure}</p> : null}
       <div className={styles['editorActions']}>
         <button