Nomad changes

.ai-rulez/domains/plugin-system/rules/plugin-interface-contract.md

@@ -0,0 +1,10 @@
+---
+priority: critical
+---
+
+- All plugins must implement the base Plugin trait: Send + Sync + 'static required
+- Plugin types: DocumentExtractor, OcrBackend, PostProcessor, Validator
+- Async execution: use async trait methods for non-blocking operations
+- Lifecycle: init() -> process() -> cleanup(). Init must validate all requirements.
+- Never panic in plugin code — all errors must be returned as Result
+- Consistent result format: all extractors return ExtractionResult with text, metadata, and confidence