docs(objectui): give every YAML form-section example a name i18n anchor

Sweep of the 13 nameless form-section mappings in YAML fences under
content/docs/protocol/objectui/**, re-derived with the `yaml` parser on
787d757. A nameless section has no i18n anchor -- its heading resolves
through `objects.OBJECT._sections.NAME.label`, so it renders its authored
label in every locale.

Names are the snake_case of each label; the one deviation is the section
labelled "Name" in layout-dsl.mdx, named `full_name` so the teaching
example does not read `name: name` beside a `name` field.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pk26oZ12t5N1hwGW1m1MgC

Author: claude

content/docs/protocol/objectui/concept.mdx

@@ -114,13 +114,15 @@ name: customer_edit
 object: customer
 layout:
   sections:
-    - label: Contact Information
+    - name: contact_information
+      label: Contact Information
       columns: 2
       fields:
         - name
         - email
         - phone
-    - label: Address
+    - name: address
+      label: Address
       columns: 1
       fields:
         - street
@@ -568,15 +570,18 @@ Show complexity only when needed:
 # Simple form for most users
 layout:
   sections:
-    - label: Basic Info
+    - name: basic_info
+      label: Basic Info
       fields: [name, email, phone]
 
 # Advanced section (collapsed by default)
 layout:
   sections:
-    - label: Basic Info
+    - name: basic_info
+      label: Basic Info
       fields: [name, email, phone]
-    - label: Advanced Settings
+    - name: advanced_settings
+      label: Advanced Settings
       collapsed: true
       fields: [api_key, webhook_url, rate_limit]
 ```

content/docs/protocol/objectui/index.mdx

@@ -165,7 +165,8 @@ object: customer
 mode: edit
 layout:
   sections:
-    - label: Basic Information
+    - name: basic_information
+      label: Basic Information
       columns: 2
       fields:
         - name
@@ -369,7 +370,8 @@ All layouts use a 12-column grid that adapts automatically:
 
 ```yaml
 sections:
-  - label: Contact Info
+  - name: contact_info
+    label: Contact Info
     columns: 2  # Desktop: 2 columns, Tablet: 1 column, Mobile: 1 column
     fields:
       - email
@@ -429,7 +431,8 @@ name: customer_edit
 object: customer  # ← References ObjectQL schema
 layout:
   sections:
-    - fields: [name, email, status]  # ← Fields auto-validated
+    - name: basic_information
+      fields: [name, email, status]  # ← Fields auto-validated
 ```
 
 **What ObjectUI Inherits from ObjectQL:**

content/docs/protocol/objectui/layout-dsl.mdx

@@ -342,7 +342,8 @@ Sections are collapsible containers for related fields.
 {/* os:check-yaml FormSectionSchema[] key=sections */}
 ```yaml
 sections:
-  - label: Contact Information
+  - name: contact_information
+    label: Contact Information
     collapsible: true
     collapsed: false  # Expanded by default
     fields:
@@ -370,10 +371,12 @@ Show sections based on field values. The key is **`visibleWhen`** and its value
 {/* os:check-yaml FormSectionSchema[] key=sections */}
 ```yaml
 sections:
-  - label: Basic Info
+  - name: basic_info
+    label: Basic Info
     fields: [name, email]
 
-  - label: Billing Information
+  - name: billing_information
+    label: Billing Information
     visibleWhen: "record.account_type == 'premium'"  # Only show for premium accounts
     fields: [payment_method, billing_address]
 ```
@@ -434,15 +437,17 @@ a field widens itself with `span: full`:
 {/* os:check-yaml FormSectionSchema[] key=sections */}
 ```yaml
 sections:
-  - label: Name
+  - name: full_name
+    label: Name
     columns: 2          # first_name and last_name share a row
     fields:
       - field: first_name
         placeholder: First
       - field: last_name
         placeholder: Last
 
-  - label: Address
+  - name: address
+    label: Address
     columns: 3
     fields:
       - field: street