feat: add GitHub templates (CODEOWNERS, PR template, issue templates) (#14)

* feat: add GitHub templates (CODEOWNERS, PR template, issue templates)

- CODEOWNERS for automatic reviewer assignment
- Pull request template with checklist
- Issue templates for bugs and feature requests

Stu Mason + AI <me@stumason.dev>

* feat: enhance templates based on code review suggestions

- Add environment/version info field to bug report template
- Add logs/error messages field with shell rendering to bug report
- Add Related Issues section to PR template
- Add Breaking Changes section to PR template

Addresses suggestions from Claude Code review on PR #14.

Stu Mason + AI <me@stumason.dev>

Author: StuMason

.github/CODEOWNERS

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+* @StuMason

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report something that's broken
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: What happened?
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behaviour
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include relevant version info
+      placeholder: |
+        - Docker version:
+        - Deployment mode (docker-compose/standalone):
+        - OS:
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Error messages
+      description: Include any relevant logs or error messages
+      render: shell
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or motivation
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+
+## Related Issues
+
+Closes #
+
+## Changes
+
+-
+
+## Breaking Changes
+
+- [ ] No breaking changes
+- [ ] Breaking changes (describe below)
+
+## Test plan
+
+- [ ] Tests added/updated
+- [ ] Manually tested locally
+
+## Checklist
+
+- [ ] Code follows project conventions
+- [ ] Documentation updated if needed