Remove completed feature categories from README

Removed feature categories section detailing completed features and priorities.

Author: devstress

README.md

@@ -170,29 +170,6 @@ FlinkDotNet provides **100% feature parity** with Apache Flink 1.0-2.1, implemen
 | **2.0** | Mar 2025 | ✅ **100%** | Disaggregated State Management, Unified Batch/Stream, API Overhaul |
 | **2.1** | Jul 2025 | ✅ **100%** | AI/ML Integration, VARIANT Type, PTFs, Performance & Format |
 
-### Feature Categories (21/21 Complete - 100% 🎉)
-
-**P0 Features (Critical - ALL COMPLETE)**:
-- ✅ **Unified Sink API v2** (WI6, Flink 1.20) - Modern sink pattern replacing SinkFunction
-- ✅ **Materialized Tables** (WI7, Flink 1.20) - Declarative ETL with auto-refresh
-- ✅ **AI/ML Integration** (WI8-WI9, Flink 2.1) - CREATE MODEL, ML_PREDICT, AI providers (OpenAI, Azure OpenAI, Amazon Bedrock, Google Vertex AI, Hugging Face)
-
-**P1 Features (High Priority - ALL COMPLETE)**:
-- ✅ **VARIANT Data Type** (WI10, Flink 2.1) - Semi-structured JSON data handling
-- ✅ **Table API & Advanced SQL** (WI10, Flink 2.1) - All 7 sub-features complete
-- ✅ **Process Table Functions (PTFs)** (WI10, Flink 2.1) - Advanced table processing
-- ✅ **Apache Paimon** (WI13, Flink 1.15-1.18) - Lakehouse storage integration
-- ✅ **Observability Testing** (WI11) - Comprehensive test coverage and monitoring
-- ✅ **Catalog API** (WI14, Flink 1.10) - Hive/JDBC/GenericInMemory catalog management
-- ✅ **Unified Source API** (WI15, Flink 1.12) - FLIP-27 modern source connector framework
-
-**P2 Features (Medium Priority - ALL COMPLETE)**:
-- ✅ **Performance & Format** (WI12, WI16, Flink 2.1) - All 4 sub-features complete:
-  - ✅ Custom Async Sink Batching (WI12)
-  - ✅ State Backend Configuration (WI16)
-  - ✅ Smile Format for Compiled Plans (WI16)
-  - ✅ MultiJoin Optimization (WI16)
-
 ## Learn FlinkDotNet
 
 **[LearningCourse](LearningCourse/README.md)** provides a 15-day hands-on course covering: