chore: add changeset for initial release

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

Author: deepracticexs

.changeset/initial-release.md

@@ -0,0 +1,11 @@
+---
+"issuexjs": minor
+"@issuexjs/core": minor
+"@issuexjs/node": minor
+---
+
+Initial release of IssueX — structured issue tracking for AI agents.
+
+- @issuexjs/core: types, store interfaces, provider abstraction
+- issuexjs: client with full CRUD for issues, comments, labels
+- @issuexjs/node: SQLite provider for Node.js/Bun