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/README.md

@@ -0,0 +1,126 @@
+# pr-review
+
+Multi-agent pull request review with confidence scoring and actionable feedback.
+
+## Overview
+
+pr-review conducts comprehensive code reviews using specialized agents for security, performance, maintainability, and test coverage. Each finding includes a confidence score to reduce noise and focus on real issues.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/pr-review <pr#>` | Full multi-agent review |
+| `/pr-summary <pr#>` | Quick summary without full review |
+| `/pr-findings <pr#>` | Filter findings by category/confidence |
+
+## Review Agents
+
+| Agent | Focus |
+|-------|-------|
+| **Security Reviewer** | Injections, auth, data exposure, crypto |
+| **Performance Analyst** | N+1 queries, complexity, memory, caching |
+| **Maintainability Auditor** | Complexity, duplication, naming, coupling |
+| **Test Validator** | Coverage, test quality, flaky tests |
+
+## Confidence Scoring
+
+Findings are scored 0.0 - 1.0:
+
+| Range | Label | Action |
+|-------|-------|--------|
+| 0.9 - 1.0 | HIGH | Must address |
+| 0.7 - 0.89 | MEDIUM | Should address |
+| 0.5 - 0.69 | LOW | Consider addressing |
+| < 0.5 | (suppressed) | Not reported |
+
+## Installation
+
+Add to your project's `.claude/settings.json`:
+
+```json
+{
+  "plugins": ["pr-review"]
+}
+```
+
+Requires Gitea MCP server configuration.
+
+## Configuration
+
+```bash
+# Minimum confidence to report (default: 0.5)
+PR_REVIEW_CONFIDENCE_THRESHOLD=0.5
+
+# Auto-submit review to Gitea (default: false)
+PR_REVIEW_AUTO_SUBMIT=false
+```
+
+## Usage Examples
+
+### Full Review
+
+```
+/pr-review 123
+
+═══════════════════════════════════════════════════
+PR Review Report: #123
+═══════════════════════════════════════════════════
+
+Summary:
+  Files changed: 12
+  Lines: +234 / -45
+
+Findings: 8 total
+  🔴 Critical: 1
+  🟠 Major: 2
+  🟡 Minor: 3
+  💡 Suggestions: 2
+
+[Detailed findings...]
+
+VERDICT: REQUEST_CHANGES
+═══════════════════════════════════════════════════
+```
+
+### Filter Findings
+
+```
+/pr-findings 123 --category security
+
+# Shows only security-related findings
+```
+
+### Quick Summary
+
+```
+/pr-summary 123
+
+# Shows change overview without full analysis
+```
+
+## Output
+
+Review reports include:
+- Summary statistics
+- Findings grouped by severity
+- Code snippets with context
+- Suggested fixes
+- Overall verdict (APPROVE/COMMENT/REQUEST_CHANGES)
+
+## Verdict Logic
+
+| Condition | Verdict |
+|-----------|---------|
+| Any critical finding | REQUEST_CHANGES |
+| 2+ major findings | REQUEST_CHANGES |
+| Only minor/suggestions | COMMENT |
+| No significant findings | APPROVE |
+
+## Integration
+
+For CLAUDE.md integration instructions, see `claude-md-integration.md`.
+
+## License
+
+MIT