feat(reference-curator): Add portable skill suite for reference documentation curation

6 modular skills for curating, processing, and exporting reference docs:
- reference-discovery: Search and validate authoritative sources
- web-crawler-orchestrator: Multi-backend crawling (Firecrawl/Node/aiohttp/Scrapy)
- content-repository: MySQL storage with version tracking
- content-distiller: Summarization and key concept extraction
- quality-reviewer: QA loop with approve/refactor/research routing
- markdown-exporter: Structured output for Claude Projects or fine-tuning

Cross-machine installation support:
- Environment-based config (~/.reference-curator.env)
- Commands tracked in repo, symlinked during install
- install.sh with --minimal, --check, --uninstall modes
- Firecrawl MCP as default (always available)

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

.claude/settings.local.json

@@ -21,7 +21,12 @@
       "Bash(git push:*)",
       "Bash(chmod:*)",
       "Bash(python3:*)",
-      "Bash(git fetch:*)"
+      "Bash(git fetch:*)",
+      "Bash(mysql:*)",
+      "Bash(brew services:*)",
+      "Bash(source ~/.envrc)",
+      "mcp__plugin_Notion_notion__notion-fetch",
+      "mcp__plugin_Notion_notion__notion-update-page"
     ]
   }
 }