ci: Add GitHub Actions (test, lint, release) and issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,25 @@
+name: Bug Report
+
+about: Report something that is not working as expected.
+
+---
+
+**Describe the bug**
+A clear description of what went wrong.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Run '...'
+3. See error
+
+**Expected behavior**
+What you expected to happen.
+
+**Environment:**
+- OS: [e.g. Debian 12, macOS 14]
+- SBCL version: [e.g. 2.4.0]
+- OpenCortex version: [e.g. v0.1.0]
+
+**Additional context**
+Any other relevant information (logs, stack traces, etc.)