feat(skill-tests): add form-add + form-compile steps to platform integration tests

Now that ExtendedPresentation and InterfaceCompatibilityMode bugs are fixed,
platform integration tests can include full form generation:
- platform-config: form-add + form-compile for Catalog and Document forms
- platform-epf: epf-add-form + form-compile with elements/attributes/commands
- platform-cfe: form-add + form-compile for borrowed Catalog form

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/skills/integration/platform-epf.test.mjs

@@ -1,6 +1,6 @@
 // platform-epf.test.mjs — Integration test: EPF build/dump roundtrip
 // Requires: 1C platform (1cv8.exe) via .v8-project.json
-// Steps: epf-init (no forms) → epf-build → epf-dump
+// Steps: epf-init → epf-add-form → form-compile → epf-build → epf-dump
 
 export const name = 'Сборка и разборка внешней обработки (roundtrip)';
 export const setup = 'none';
@@ -14,7 +14,35 @@ export const steps = [
     args: { '-Name': 'RoundtripТест', '-SrcDir': '{workDir}' },
   },
 
-  // ── 2. Build EPF binary ──
+  // ── 2. Add form to EPF ──
+  {
+    name: 'epf-add-form: форма обработки',
+    script: 'epf-add-form/scripts/add-form',
+    args: {
+      '-ObjectPath': '{workDir}/RoundtripТест.xml',
+      '-FormName': 'Форма',
+    },
+  },
+
+  {
+    name: 'form-compile: наполнение формы обработки',
+    script: 'form-compile/scripts/form-compile',
+    input: {
+      elements: [
+        { id: 'ПутьКФайлу', type: 'input', path: 'ПутьКФайлу', title: 'Путь к файлу' },
+        { id: 'Загрузить', type: 'button', title: 'Загрузить', action: 'Загрузить' },
+      ],
+      attributes: [
+        { id: 'ПутьКФайлу', type: 'String' },
+      ],
+      commands: [
+        { id: 'Загрузить', title: 'Загрузить' },
+      ],
+    },
+    args: { '-FormPath': '{workDir}/RoundtripТест/Forms/Форма', '-JsonPath': '{inputFile}' },
+  },
+
+  // ── 3. Build EPF binary ──
   {
     name: 'epf-build: сборка EPF',
     script: 'epf-build/scripts/epf-build',
@@ -25,14 +53,14 @@ export const steps = [
     },
   },
 
-  // ── 3. Create temp DB for dump (epf-dump requires database connection) ──
+  // ── 4. Create temp DB for dump ──
   {
     name: 'db-create: временная ИБ для разборки',
     script: 'db-create/scripts/db-create',
     args: { '-V8Path': '{v8path}', '-InfoBasePath': '{workDir}/tmpdb' },
   },
 
-  // ── 4. Dump EPF back to XML ──
+  // ── 5. Dump back to XML ──
   {
     name: 'epf-dump: разборка EPF в XML',
     script: 'epf-dump/scripts/epf-dump',