feat: post-run validation + integration tests for skill pipeline

- runner.mjs v0.4: --with-validation flag runs validators on real output
- postValidate config in 20 _skill.json files (maps skill → validator)
- validatePath in ~100 positive test cases
- skipValidation for 5 cross-reference cases (isolated workspace limitation)
- Integration tests: build-config (19 steps), build-epf (6), build-cfe (4)
- base-config cache from build-config for downstream tests
- Fix chart-of-calculation-types test data (DependenceOnCalculationTypes)
- 285/285 unit + 3/3 integration, all green with validation

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

tests/skills/cases/meta-compile/data-processor.json

@@ -5,6 +5,7 @@
     "name": "ЗагрузкаДанных",
     "attributes": ["ПутьКФайлу: String(500)"]
   },
+  "validatePath": "DataProcessors/ЗагрузкаДанных",
   "expect": {
     "files": ["DataProcessors/ЗагрузкаДанных.xml", "DataProcessors/ЗагрузкаДанных/Ext/ObjectModule.bsl"]
   }