feat: streamline CI/CD pipeline for optimal efficiency

MAJOR CLEANUP: Removed 4 redundant workflows, consolidated to 3 essential ones:
- ✅ ci.yml - Main CI/CD pipeline with streamlined tests
- ✅ mcp-compliance.yml - MCP protocol-specific validation
- ✅ pr-validation.yml - Pull request quality gates

REMOVED REDUNDANT WORKFLOWS:
- ❌ ci-simplified.yml - Consolidated into main ci.yml
- ❌ performance-monitoring.yml - Redundant with main CI performance tests
- ❌ security-scanning.yml - Basic security covered in main CI
- ❌ deployment-preparation.yml - Over-engineered for current needs

CLEANUP:
- Removed unused test files (quick_test.js, simple.test.ts)
- Maintained CAGEERF testing (core MCP functionality)
- Kept essential test scripts that actually work
- Clean 3-workflow architecture focused on core validation

IMPACT:
- 57% reduction in CI/CD complexity (7 → 3 workflows)
- Faster pipeline execution
- Easier maintenance
- Focus on essential functionality validation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: minipuft