chore: add bug report issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Report something that isn't working correctly
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behaviour:
+1.
+2.
+3.
+
+**Expected behaviour**
+What you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment**
+- macOS version: [e.g. Sequoia 15.4]
+- ClaudeChecker version: [e.g. 1.1.3]
+- Claude plan: [e.g. Pro, Max]
+
+**Additional context**
+Any other context about the problem here.