feat(skd): DataSetFieldFolder + GroupItemAuto + empty-field selection

Закрывает три gap'a, выявленных при полном прогоне ERP+ACC:

1. DataSetFieldFolder — поле-папка для UI-группировки полей в композиторе
   настроек. Только dataPath + title, без valueType/role.
   - DSL: object form поля с `folder: true`.
   - Compile: при folder=true → <field xsi:type="DataSetFieldFolder">.
   - Decompile: распознать xsi:type, эмитить object form.

2. GroupItemAuto — пустой <item xsi:type="GroupItemAuto"/> в groupItems
   (auto-grouping, аналогично "Auto" в selection).
   - DSL: строка "Auto" в groupFields.
   - Compile/decompile: round-trip.

3. Empty <field/> в conditionalAppearance/selection (wildcard — apply
   to all). Раньше — SelectionItem: sentinel. Теперь эмитим как "Auto"
   (семантический эквивалент через SelectedItemAuto).

Новый тест dataset-folder-and-auto-group (round-trip).
Versions: compile v1.34→v1.35, decompile v0.16→v0.17.

На предыдущем прогоне ERP+ACC: 227 sentinel'ов (218 DataSetFieldFolder
+ 7 GroupItemAuto + 2 SelectionItem). После — 0.

.claude/skills/skd-compile/scripts/skd-compile.ps1

@@ -1,4 +1,4 @@
-# skd-compile v1.34 — Compile 1C DCS from JSON
+# skd-compile v1.35 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[string]$DefinitionFile,
@@ -848,6 +848,19 @@ function Emit-Field {
 		if ($null -ne $fieldDef.inputParameters) {
 			$f["inputParameters"] = $fieldDef.inputParameters
 		}
+		# folder: true → DataSetFieldFolder (поле-папка для UI-группировки, только dataPath+title)
+		if ($fieldDef.folder -eq $true) {
+			$f["folder"] = $true
+		}
+	}
+
+	# DataSetFieldFolder — только dataPath + title (для UI-группировки полей в композиторе)
+	if ($f["folder"]) {
+		X "$indent<field xsi:type=`"DataSetFieldFolder`">"
+		X "$indent`t<dataPath>$(Esc-Xml $f.dataPath)</dataPath>"
+		if ($f.title) { Emit-MLText -tag "title" -text $f.title -indent "$indent`t" }
+		X "$indent</field>"
+		return
 	}
 
 	X "$indent<field xsi:type=`"DataSetFieldField`">"
@@ -2239,6 +2252,11 @@ function Emit-GroupItems {
 	X "$indent<dcsset:groupItems>"
 	foreach ($field in $groupBy) {
 		if ($field -is [string]) {
+			if ($field -eq 'Auto') {
+				# Auto-группировка (по аналогии с "Auto" в selection)
+				X "$indent`t<dcsset:item xsi:type=`"dcsset:GroupItemAuto`"/>"
+				continue
+			}
 			X "$indent`t<dcsset:item xsi:type=`"dcsset:GroupItemField`">"
 			X "$indent`t`t<dcsset:field>$(Esc-Xml $field)</dcsset:field>"
 			X "$indent`t`t<dcsset:groupType>Items</dcsset:groupType>"

.claude/skills/skd-compile/scripts/skd-compile.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# skd-compile v1.34 — Compile 1C DCS from JSON
+# skd-compile v1.35 — Compile 1C DCS from JSON
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 import argparse
 import json
@@ -642,6 +642,18 @@ def emit_field(lines, field_def, indent):
         # inputParameters — массив элементов, типизированных по форме value
         if field_def.get('inputParameters') is not None:
             f['inputParameters'] = field_def['inputParameters']
+        # folder: true → DataSetFieldFolder
+        if field_def.get('folder') is True:
+            f['folder'] = True
+
+    # DataSetFieldFolder — только dataPath + title
+    if f.get('folder'):
+        lines.append(f'{indent}<field xsi:type="DataSetFieldFolder">')
+        lines.append(f'{indent}\t<dataPath>{esc_xml(f["dataPath"])}</dataPath>')
+        if f.get('title'):
+            emit_mltext(lines, f'{indent}\t', 'title', f['title'])
+        lines.append(f'{indent}</field>')
+        return
 
     lines.append(f'{indent}<field xsi:type="DataSetFieldField">')
     lines.append(f'{indent}\t<dataPath>{esc_xml(f["dataPath"])}</dataPath>')
@@ -1861,6 +1873,9 @@ def emit_group_items(lines, group_by, indent):
     lines.append(f'{indent}<dcsset:groupItems>')
     for field in group_by:
         if isinstance(field, str):
+            if field == 'Auto':
+                lines.append(f'{indent}\t<dcsset:item xsi:type="dcsset:GroupItemAuto"/>')
+                continue
             lines.append(f'{indent}\t<dcsset:item xsi:type="dcsset:GroupItemField">')
             lines.append(f'{indent}\t\t<dcsset:field>{esc_xml(field)}</dcsset:field>')
             lines.append(f'{indent}\t\t<dcsset:groupType>Items</dcsset:groupType>')

.claude/skills/skd-decompile/scripts/skd-decompile.ps1

@@ -1,4 +1,4 @@
-# skd-decompile v0.16 — Decompile 1C DCS Template.xml to JSON DSL (draft)
+# skd-decompile v0.17 — Decompile 1C DCS Template.xml to JSON DSL (draft)
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 param(
 	[Parameter(Mandatory)]
@@ -1152,6 +1152,9 @@ function Build-SelectionItem {
 	if (-not $xt) {
 		$fName = Get-Text $item "dcsset:field"
 		if ($fName) { return $fName }
+		# Пустой <field/> → wildcard (apply to all) — эквивалентно Auto
+		$fieldEl = $item.SelectSingleNode("dcsset:field", $ns)
+		if ($fieldEl) { return 'Auto' }
 	}
 	switch ($xt) {
 		'SelectedItemAuto' { return 'Auto' }
@@ -1352,7 +1355,9 @@ function Get-GroupFields {
 	if (-not $gi) { return ,$gFields }
 	foreach ($gItem in $gi.SelectNodes("dcsset:item", $ns)) {
 		$gxt = Get-LocalXsiType $gItem
-		if ($gxt -eq 'GroupItemField') {
+		if ($gxt -eq 'GroupItemAuto') {
+			$gFields += 'Auto'
+		} elseif ($gxt -eq 'GroupItemField') {
 			$gf = Get-Text $gItem "dcsset:field"
 			$pat = Get-Text $gItem "dcsset:periodAdditionType"
 			$gt = Get-Text $gItem "dcsset:groupType"
@@ -1613,10 +1618,20 @@ function Build-DataSet {
 		$fi = 0
 		foreach ($fn in $fieldNodes) {
 			$fxsi = Get-LocalXsiType $fn
-			if ($fxsi -ne 'DataSetFieldField') {
-				$fields += (New-Sentinel -kind "FieldType:$fxsi" -loc "$loc/field[$fi]" -detail 'Тип поля не DataSetFieldField')
-			} else {
+			if ($fxsi -eq 'DataSetFieldField') {
 				$fields += (Build-Field -fieldNode $fn -loc "$loc/field[$fi]")
+			} elseif ($fxsi -eq 'DataSetFieldFolder') {
+				# Поле-папка для UI-группировки (только dataPath+title, без типа/роли)
+				$folderObj = [ordered]@{
+					field = (Get-Text $fn "r:dataPath")
+					folder = $true
+				}
+				$titleNode = $fn.SelectSingleNode("r:title", $ns)
+				$title = Get-MLText $titleNode
+				if ($title) { $folderObj['title'] = $title }
+				$fields += $folderObj
+			} else {
+				$fields += (New-Sentinel -kind "FieldType:$fxsi" -loc "$loc/field[$fi]" -detail 'Тип поля не DataSetFieldField/Folder')
 			}
 			$fi++
 		}