feat(workflows): add PowerShell scripts and refactor workflow Skill
- Add 4 PowerShell workflow scripts for cross-platform automation:
- 01-community-ops.ps1: Issue auto-classify, assign, weekly report, release notes
- 03-project-init.ps1: One-click project init with README, CONTRIBUTING, CI guide, issues, branch protection, release
- 04-multi-repo-collab.ps1: Cross-repo dashboard with HTML output and coordinated release
- 05-contributor-growth.ps1: Contributor scoring (AHP), HTML report, Wiki, badge awards
- Add workflows/lib/common.psm1 shared PowerShell module
- Refactor gitlink-workflow SKILL.md to focus on AI-powered code review (workflow 2)
- Retain original .sh scripts alongside new .ps1 scripts
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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