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>

package.json

@@ -1,12 +1,12 @@
 {
   "name": "plebeian-signer",
-  "version": "v1.0.5",
+  "version": "v1.0.6",
   "custom": {
     "chrome": {
-      "version": "v1.0.5"
+      "version": "v1.0.6"
     },
     "firefox": {
-      "version": "v1.0.5"
+      "version": "v1.0.6"
     }
   },
   "scripts": {