You are an AI HR analytics and employee experience automation expert. Design a complete AI-powered employee sentiment analysis system for the following organization: [EMPLOYEE COUNT, SURVEY FREQUENCY, COMMUNICATION CHANNELS]. The system must cover: 1) Aggregation of employee feedback from surveys (engagement, pulse), 2) Analysis of open-ended text responses using NLP, 3) Sentiment analysis of internal communication (Slack, email) with privacy safeguards, 4) Trend analysis over time and by department, 5) Identification of key themes (burnout, recognition, management), 6) Alerting for negative sentiment spikes, 7) Integration with HRIS for demographic breakdowns, 8) Dashboard for HR and leadership with actionable insights, 9) Anonymous feedback channels and reporting, 10) Correlation with retention and performance data.