Consolidate changelog to v1.1.0, add GitHub link, universal ZIP README

- Combined all post-v1.0 changelog entries into single v1.1.0
- Updated version to 1.1.0 in package.json, plugin.json, marketplace.json
- Added GitHub icon link to hero top-right
- Added README.txt to universal ZIP (macOS hides dotfile-only folders)
- Added versioning instructions to CLAUDE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "impeccable",
   "description": "Design vocabulary and skills for frontend development. Includes 18 skills (17 user-invokable: /polish, /distill, /audit, /bolder, /quieter, etc.) and an enhanced frontend-design skill with curated anti-patterns.",
-  "version": "2.0.0",
+  "version": "1.1.0",
   "author": {
     "name": "Paul Bakaus",
     "email": "paul@paulbakaus.com"