refactor(clarity-assist): extract skills from commands

Extract shared knowledge from clarify.md and quick-clarify.md into
reusable skill files:
- 4d-methodology.md: Core 4-phase clarification process
- nd-accommodations.md: Neurodivergent-friendly question patterns
- clarification-techniques.md: Anti-patterns and question templates
- escalation-patterns.md: Mode switching guidelines

Commands slimmed from 149/96 lines to 44/49 lines respectively.

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

plugins/pr-review/commands/pr-summary.md

@@ -2,19 +2,13 @@
 
 ## Visual Output
 
-When executing this command, display the plugin header:
+Display header: `PR-REVIEW - Quick Summary`
 
-```
-┌──────────────────────────────────────────────────────────────────┐
-│  🔍 PR-REVIEW · Quick Summary                                     │
-└──────────────────────────────────────────────────────────────────┘
-```
+## Skills to Load
 
-Then proceed with the summary.
-
-## Purpose
-
-Generate a quick summary of PR changes without conducting a full multi-agent review.
+- skills/mcp-tools-reference.md
+- skills/pr-analysis.md
+- skills/output-formats.md
 
 ## Usage
 
@@ -22,94 +16,26 @@ Generate a quick summary of PR changes without conducting a full multi-agent rev
 /pr-summary <pr-number> [--repo owner/repo]
 ```
 
-## Behavior
+## Workflow
 
 ### Step 1: Fetch PR Data
 
-Using Gitea MCP tools:
-1. `get_pull_request` - PR metadata
-2. `get_pr_diff` - Code changes
+Load MCP tools, then: `get_pull_request`, `get_pr_diff`
 
 ### Step 2: Analyze Changes
 
-Quick analysis of:
-- Files modified
-- Types of changes (features, fixes, refactoring)
-- Scope and impact
+Execute `skills/pr-analysis.md`:
+- Categorize changes (feature, fix, refactor)
+- Calculate statistics
+- Identify key files
+- Assess scope and risk
 
 ### Step 3: Generate Summary
 
-```
-═══════════════════════════════════════════════════
-PR Summary: #123 - Add user authentication
-═══════════════════════════════════════════════════
-
-Author: @johndoe
-Branch: feat/user-auth → development
-Status: Open (ready for review)
-
-───────────────────────────────────────────────────
-CHANGES OVERVIEW
-───────────────────────────────────────────────────
-
-Files: 12 changed
-  + 8 new files
-  ~ 3 modified files
-  - 1 deleted file
-
-Lines: +234 / -45 (net +189)
-
-───────────────────────────────────────────────────
-WHAT THIS PR DOES
-───────────────────────────────────────────────────
-
-This PR adds user authentication functionality:
-
-1. **New API endpoints**
-   - POST /api/auth/login
-   - POST /api/auth/register
-   - POST /api/auth/logout
-
-2. **Frontend components**
-   - LoginForm component
-   - RegisterForm component
-   - Auth context provider
-
-3. **Database changes**
-   - New users table
-   - Sessions table
-
-───────────────────────────────────────────────────
-KEY FILES
-───────────────────────────────────────────────────
-
-• src/api/auth/login.ts (+85) - Login endpoint
-• src/api/auth/register.ts (+120) - Registration
-• src/components/LoginForm.tsx (+65) - Login UI
-• src/db/migrations/001_users.sql (+45) - Schema
-
-───────────────────────────────────────────────────
-QUICK ASSESSMENT
-───────────────────────────────────────────────────
-
-Scope: Medium (authentication feature)
-Risk: Medium (new security-sensitive code)
-Recommendation: Full /pr-review suggested
-
-═══════════════════════════════════════════════════
-```
-
-## Output
-
-Summary report with:
-- PR metadata
-- Change statistics
-- Plain-language description of changes
-- Key files list
-- Quick risk assessment
+Use summary format from `skills/output-formats.md`
 
 ## When to Use
 
-- Get quick overview before full review
+- Quick overview before full review
 - Triage multiple PRs
-- Understand PR scope
+- Decide if /pr-review is needed