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/skills/mcp-tools-reference.md

@@ -0,0 +1,80 @@
+# MCP Tools Reference - Gitea PR Operations
+
+## Available Tools
+
+Use `ToolSearch` to load these tools before use.
+
+### Pull Request Tools
+
+| Tool | Purpose |
+|------|---------|
+| `mcp__gitea__list_pull_requests` | List PRs (open, closed, all) |
+| `mcp__gitea__get_pull_request` | Get PR metadata, status, labels |
+| `mcp__gitea__get_pr_diff` | Get unified diff of changes |
+| `mcp__gitea__get_pr_comments` | Get review comments and discussions |
+| `mcp__gitea__create_pr_review` | Submit review (approve, comment, request changes) |
+| `mcp__gitea__add_pr_comment` | Add single comment to PR |
+| `mcp__gitea__create_pull_request` | Create new PR |
+
+### Supporting Tools
+
+| Tool | Purpose |
+|------|---------|
+| `mcp__gitea__get_issue` | Get linked issue details |
+| `mcp__gitea__get_labels` | Get available labels |
+| `mcp__gitea__validate_repo_org` | Validate repository exists |
+
+## Loading Tools
+
+Before using MCP tools, load them:
+
+```
+Use ToolSearch with query: "+gitea pull_request"
+```
+
+## Common Operations
+
+### Fetch PR for Review
+
+```
+1. get_pull_request(pr_number) -> metadata
+2. get_pr_diff(pr_number) -> code changes
+3. get_pr_comments(pr_number) -> existing feedback
+```
+
+### Submit Review
+
+```
+create_pr_review:
+  pr_number: number
+  body: string (review summary)
+  event: "APPROVE" | "COMMENT" | "REQUEST_CHANGES"
+  comments: [{path, line, body}] (optional inline comments)
+```
+
+### Add Comment
+
+```
+add_pr_comment:
+  pr_number: number
+  body: string
+```
+
+## Environment Variables
+
+Required in `.env`:
+- `GITEA_ORG` - Organization/owner name
+- `GITEA_REPO` - Repository name
+
+Required in `~/.config/claude/gitea.env`:
+- `GITEA_API_URL` - Gitea server URL
+- `GITEA_API_TOKEN` - API token with repo permissions
+
+## Error Handling
+
+| Error | Cause | Resolution |
+|-------|-------|------------|
+| Tool not found | MCP not loaded | Run ToolSearch first |
+| 401 Unauthorized | Invalid/expired token | Regenerate token |
+| 404 Not Found | Wrong org/repo or PR doesn't exist | Check .env settings |
+| 403 Forbidden | Insufficient permissions | Check token scopes |