chore: action default py 3.14→3.12 + gitignore .playwright-cli (slice #51)

[buildrr89]

Summary

• `action.yml` default `python-version` changed from `"3.14"` to `"3.12"`. 3.14 isn't universally cached on GitHub-hosted runners yet — consumers paid a cold `setup-python` download on every run. 3.12 matches our declared `requires-python = ">=3.12"` floor.
• `.playwright-cli/` added to `.gitignore` — local `rade analyze --url` runs leave trace/console artifacts there.

Supersedes #4 (which was based on a misread of `requires-python` and would have pinned to `3.14.3`). Maintainers who want newer can still set `python-version: "3.14.3"` in their own workflow.

Test plan

• `uv run pytest -q` — 210 passing
• Wheel smoke matrix still exercises 3.12/3.13/3.14 on PR

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 78374196-4715-4e3b-b0bf-4f066cd2c074

📥 Commits

Reviewing files that changed from the base of the PR and between c292105 and 8962eca.

📒 Files selected for processing (4)

• .gitignore
• CHANGELOG.md
• action.yml
• docs/NEXT_EXECUTION_BACKLOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch slice-51-action-py-default-and-gitignore

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