Publish project-kickoff skill to skills.sh

[gurvinder-dhillon]

Goal

Get `project-kickoff` listed on the skills.sh leaderboard so users can install it with:

```bash
npx skills add openqa-labs/maestro/project-kickoff
```

Steps

• Review skills.sh submission process at https://skills.sh/docs
• Verify `skills/project-kickoff/SKILL.md` meets all registry requirements
• Submit or register the skill on skills.sh
• Test install from a fresh directory: `npx skills add openqa-labs/maestro/project-kickoff`
• Add install badge to README

Notes

Skill is already structured and CI-validated. This is a publishing/distribution task.