chore: add bulletproof CI

[phj6688]

Adds a GitHub Actions CI workflow for this Claude Code skill repo (skill + Python).

Jobs, all funneling into a single aggregate gate job named `CI passed`:

• validate-skill: validates `skill/SKILL.md` frontmatter (name + description present, YAML parses) and any `plugin.json`/`marketplace.json` manifests.
• lint: `ruff check .` (passes clean). `ruff format --check` is intentionally not run: the repo ships no ruff config and the scripts are deliberately hand-formatted, so format-check would impose a style the repo never adopted.
• test (3.11 + 3.12): runs the validator suite `skill/scripts/tests/test_validate.py` directly (it asserts via exit code; it is not pytest-collectable).
• import-sanity: imports `validate_issue`, then smoke-runs the CLI on a known-good draft (expects exit 0) and a bad draft (expects non-zero).

Triggers on pull_request + push to [dev, master, main]; `permissions: contents: read`; concurrency cancel-in-progress.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8d08cf17-4239-4018-b558-f72cad51b797

📥 Commits

Reviewing files that changed from the base of the PR and between a54e630 and 78e5e21.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/ci

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