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

.github/ISSUE_TEMPLATE/bug_report.yml

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+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.)

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+
+about: Suggest a new feature or enhancement.
+
+---
+
+**Describe the problem**
+What problem does this feature solve?
+
+**Describe the ideal solution**
+A clear description of what you want to happen.
+
+**Describe alternatives considered**
+Any alternative solutions you've considered.
+
+**Additional context**
+Any other relevant context (mockups, related issues, etc.)
+
+**Implementation suggestion**
+(Optional) If you have thoughts on how to implement this in pure Common Lisp + Org-mode:
+- Which skill should own this?
+- Should it be a =def-cognitive-tool=, a new skill, or an enhancement to an existing one?