ci: add CI, PR template, CODEOWNERS (#5)

.github/CODEOWNERS

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+* @andybaran

.github/pull_request_template.md

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+## Checklist
+
+- [ ] Linked issue included in the PR body (for example, `Closes #N`)
+- [ ] Implementation plan was reviewed and approved before code changes
+- [ ] Code review has passed
+- [ ] Tests and CI are green
+- [ ] PR title uses Conventional Commits format
+- [ ] No secrets or credentials are committed
+- [ ] Squash-merge is intended

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  validate:
+    name: Validate skill
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Install ShellCheck
+        run: sudo apt-get update && sudo apt-get install -y shellcheck
+
+      - name: Run ShellCheck
+        run: shellcheck skills/issue-driven-github-flow/scripts/*.sh tests/*.sh
+
+      - name: Run test suite
+        run: bash tests/run.sh
+
+      - name: Validate evals JSON
+        run: python3 -c "import json,sys; json.load(open('skills/issue-driven-github-flow/evals/evals.json'))"