[2.8.2] Update gemini-imagegen skill to use Pro model by default

- Changed default model to gemini-2.0-flash-exp-image-generation
- Removed regular Nano Banana model references
- Added explicit options for aspect ratio (1:1 to 21:9)
- Added resolution options (1K default, 2K, 4K)
- Simplified documentation with clear defaults

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

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

plugins/compounding-engineering/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "compounding-engineering",
-  "version": "2.8.1",
+  "version": "2.8.2",
   "description": "AI-powered development tools. 24 agents, 16 commands, 11 skills, 2 MCP servers for code review, research, design, and workflow automation.",
   "author": {
     "name": "Kieran Klaassen",