chore: add changeset for display condition plugins

Author: prosdev

.changeset/display-condition-plugins.md

@@ -0,0 +1,28 @@
+---
+"@prosdevlab/experience-sdk": minor
+"@prosdevlab/experience-sdk-plugins": minor
+---
+
+feat: add display condition plugins with event-driven architecture
+
+Add 4 new display condition plugins with comprehensive testing and documentation:
+
+**New Plugins:**
+- Exit Intent: Velocity-based mouse tracking with session awareness
+- Scroll Depth: Multiple thresholds with advanced engagement metrics
+- Page Visits: Session and lifetime counters with first-visit detection
+- Time Delay: Millisecond-precision delays with visibility API integration
+
+**Core Enhancements:**
+- Event-driven trigger architecture (`trigger:*` events)
+- Composable display conditions (AND/OR/NOT logic)
+- TriggerState interface for type-safe context updates
+
+**Developer Experience:**
+- 101 new tests across 4 plugins (314 total)
+- 12 integration tests for plugin composition
+- Complete API documentation with examples
+- Pure functions for easier testing
+
+All plugins are backward compatible and work independently or together.
+