Release v1.0.6 - Add store publishing documentation

- Store description for Chrome Web Store and Firefox Add-ons
- Privacy policy (no data collection, local-only storage)
- Comprehensive publishing guide with step-by-step checklists
- Concise publishing checklist for quick reference

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

projects/firefox/public/manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 3,
   "name": "Plebeian Signer",
   "description": "Nostr Identity Manager & Signer",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "homepage_url": "https://git.mleku.dev/mleku/plebeian-signer",
   "options_page": "options.html",
   "permissions": [