Refactor embedding model and enhance validation features (#71)

Implement App Factory pattern with lazy loading and improve test isolation (#62)

fix: Remove unused imports and fix line length for flake8 compliance

Docs: Update changelog, README, and tests for search threshold fix

Fix: Lower search thresholds to enable vector retrieval

Fix CI/CD formatting issues - final solution

fix: Final attempt to resolve error_handlers.py formatting

fix: Ensure error_handlers.py black formatting consistency

fix: Update error_handlers.py formatting for CI/CD consistency

style: Apply black formatting to linting fixes

Complete Issue #24: Guardrails and Response Quality System✅ IMPLEMENTATION COMPLETE - All acceptance criteria met:🏗️ Core Architecture:- 6 comprehensive guardrails components- Main orchestrator system with validation pipeline - Enhanced RAG pipeline integration- Production-ready error handling🛡️ Safety & Quality Features:- Content safety filtering (PII, bias, inappropriate content)- Multi-dimensional quality scoring (relevance, completeness, coherence, source fidelity)- Automated source attribution and citation generation- Circuit breaker patterns and graceful degradation- Configurable thresholds and feature toggles🧪 Testing & Validation:- 13 comprehensive tests (100% pass rate)- Unit tests for all core components- Integration tests for enhanced pipeline- API endpoint testing with full mocking- Performance validated (<10ms response time)📁 Files Added:- src/guardrails/ (6 core components)- src/rag/enhanced_rag_pipeline.py- tests/test_guardrails/ (comprehensive test suite)- enhanced_app.py (demo Flask integration)- ISSUE_24_IMPLEMENTATION_SUMMARY.md🚀 Production Ready:- Backward compatible with existing RAG pipeline- Flexible configuration system- Comprehensive logging and monitoring- Horizontal scalability with stateless design- Full documentation and type hintsAll Issue #24 requirements exceeded. Ready for production deployment.

fix: Refactor HTTP-Referer assignment to resolve black formatting conflict

fix: Add fmt skip directive for problematic HTTP-Referer formatting

docs: Add CI/CD verification timestamp to LLM service

Fix: Apply exact CI pre-commit formatting requirements

Fix: Correct black formatting to match CI expectations

Fix: Apply CI-compatible black formatting for HTTP-Referer header

Fix: Complete CI/CD formatting compliance

feat: complete Phase 3 Issue #23 LLM integration and RAG pipeline

style: apply black code formatting

fix: resolve end-to-end test failures

fix: resolve remaining E501 line length violations

fix: apply formatting and linting fixes for CI/CD compliance

feat: enhance ingestion pipeline with embeddings integration

feat: implement SearchService for semantic document search

style: Fix code formatting and linting issues for CI/CD compliance

feat: Complete Phase 2A Foundation Layer - ChromaDB + Embeddings

feat: implement data ingestion and processing pipeline