feat: v3.0.0 architecture overhaul

- Rename marketplace to lm-claude-plugins
- Move MCP servers to root with symlinks
- Add 6 PR tools to Gitea MCP (list_pull_requests, get_pull_request,
  get_pr_diff, get_pr_comments, create_pr_review, add_pr_comment)
- Add clarity-assist plugin (prompt optimization with ND accommodations)
- Add git-flow plugin (workflow automation)
- Add pr-review plugin (multi-agent review with confidence scoring)
- Centralize configuration docs
- Update all documentation for v3.0.0

BREAKING CHANGE: MCP server paths changed, marketplace renamed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/pr-review/claude-md-integration.md

@@ -0,0 +1,46 @@
+# pr-review - CLAUDE.md Integration
+
+Add the following section to your project's CLAUDE.md file to enable pr-review.
+
+---
+
+## Pull Request Review
+
+This project uses the pr-review plugin for automated code review.
+
+### Commands
+
+| Command | Use Case |
+|---------|----------|
+| `/pr-review <pr#>` | Full multi-agent review |
+| `/pr-summary <pr#>` | Quick change summary |
+| `/pr-findings <pr#>` | Filter review findings |
+
+### Review Categories
+
+Reviews analyze:
+- **Security**: Injections, auth issues, data exposure
+- **Performance**: N+1 queries, complexity, memory
+- **Maintainability**: Code quality, duplication, naming
+- **Tests**: Coverage gaps, test quality
+
+### Confidence Threshold
+
+Findings below 0.5 confidence are suppressed.
+
+- HIGH (0.9+): Definite issue
+- MEDIUM (0.7-0.89): Likely issue
+- LOW (0.5-0.69): Possible concern
+
+### Verdict Rules
+
+| Condition | Verdict |
+|-----------|---------|
+| Critical findings | REQUEST_CHANGES |
+| 2+ Major findings | REQUEST_CHANGES |
+| Minor only | COMMENT |
+| No issues | APPROVE |
+
+---
+
+Copy the section between the horizontal rules into your CLAUDE.md.