Add gemini-imagegen skill and fix component counts

- Add gemini-imagegen skill for image generation with Gemini API
- Fix component counts: 17 agents (was 15), 6 commands, 1 skill
- Add comprehensive README documenting all components
- Add CHANGELOG tracking version history
- Bump version to 1.1.0

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

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

plugins/compounding-engineering/CHANGELOG.md

@@ -0,0 +1,25 @@
+# Changelog
+
+## [1.1.0] - 2024-11-22
+
+### Added
+- **gemini-imagegen skill** - Generate and edit images using Google's Gemini API
+  - Text-to-image generation
+  - Image editing and manipulation
+  - Multi-turn refinement via chat
+  - Multiple reference image composition (up to 14 images)
+  - Supports both `gemini-2.5-flash-image` and `gemini-3-pro-image-preview` models
+
+### Fixed
+- Corrected component counts in documentation (17 agents, not 15)
+
+### Documentation
+- Added comprehensive README with all components listed
+- Added this changelog
+
+## [1.0.0] - 2024-10-09
+
+### Added
+- Initial release with 17 specialized agents
+- 6 slash commands for common workflows
+- MIT license