feat(skills): add pr-quality skill v2.0 with architecture awareness

[aaronwong1989]

Summary

This PR adds the pr-quality skill v2.0 to HotPlex, an expert-level PR quality assurance assistant specifically designed for HotPlex's multi-channel, multi-worker, and cross-platform architecture.

Changes

• Add pr-quality skill v2.0: Expert-level PR assistant for HotPlex

  • HotPlex-specific configuration (make test/lint, hrygo/hotplex)
  • Architecture-aware commit scopes (channel/worker/platform)
  • Multi-channel support: Slack, Feishu, WebChat
  • Multi-worker support: CC, OCS, Pi
  • Cross-platform CI monitoring (Linux/macOS/Windows)
  • Intelligent codecov handling with ROI-based decision tree
  • Automatic fork detection (supports all contributors)
  • Incremental push support for existing PRs

• Skill structure optimization:

  • SKILL.md: 708 lines → 438 lines (-38%)
  • references/architecture.md: 337 lines of detailed architecture docs
  • evals/evals.json: 5 functional test cases
  • evals/trigger_evals.json: 20 trigger evaluation queries

• Description optimization:

  • Reduced length by 31% while maintaining all trigger keywords
  • Improved trigger rate with more direct language

架构影响：

• Channel: N/A (skill infrastructure)
• Worker: N/A (skill infrastructure)
• 平台: 跨平台 (skill files)

Test Plan

• make test - All tests pass
• make lint - Zero issues
• Skill structure validated (< 500 lines)
• Eval queries created (20 trigger tests)
• Documentation updated (README, QUICKSTART, MIGRATION, EXAMPLES)
• Incremental push support added

Related Issues

N/A - Infrastructure improvement

---

Files Added: 9 files, 2813 insertions

🤖 Generated with Claude Code