chore(release): bump version to 0.0.12 and record the release

Record the published 0.0.12 release version in package.json and
package-lock.json, and add the release notes plus the handoff entry.

Published installer: release/publish/0.0.12/YCode-0.0.12-Setup-x64.exe
SHA-256 9ebeceb2505af9b3607887622e6ede0ab13c4e44afb63320ff5c4884df8329ea

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "ycode",
-  "version": "0.0.11",
+  "version": "0.0.12",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "ycode",
-      "version": "0.0.11",
+      "version": "0.0.12",
       "dependencies": {
         "@anthropic-ai/claude-agent-sdk": "^0.3.304",
         "@anthropic-ai/sdk": "^0.135.0",