feat(reference-curator): Add Claude.ai Projects export format

Add claude-project/ folder with skill files formatted for upload to
Claude.ai Projects (web interface):

- reference-curator-complete.md: All 6 skills consolidated
- INDEX.md: Overview and workflow documentation
- Individual skill files (01-06) without YAML frontmatter

Add --claude-ai option to install.sh:
- Lists available files for upload
- Optionally copies to custom destination directory
- Provides upload instructions for Claude.ai

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

custom-skills/90-reference-curator/claude-project/INDEX.md

@@ -0,0 +1,89 @@
+# Reference Curator - Claude.ai Project Knowledge
+
+This project knowledge enables Claude to curate, process, and export reference documentation through 6 modular skills.
+
+## Skills Overview
+
+| Skill | Purpose | Trigger Phrases |
+|-------|---------|-----------------|
+| **reference-discovery** | Search & validate authoritative sources | "find references", "search documentation", "discover sources" |
+| **web-crawler** | Multi-backend crawling orchestration | "crawl URL", "fetch documents", "scrape pages" |
+| **content-repository** | MySQL storage management | "store content", "save to database", "check duplicates" |
+| **content-distiller** | Summarize & extract key concepts | "distill content", "summarize document", "extract key concepts" |
+| **quality-reviewer** | QA scoring & routing decisions | "review content", "quality check", "assess distilled content" |
+| **markdown-exporter** | Export to markdown/JSONL | "export references", "generate project files", "create markdown output" |
+
+## Workflow
+
+```
+[Topic Input]
+     │
+     ▼
+┌─────────────────────┐
+│ reference-discovery │ → Search & validate sources
+└─────────────────────┘
+     │
+     ▼
+┌─────────────────────┐
+│ web-crawler         │ → Crawl (Firecrawl/Node.js/aiohttp/Scrapy)
+└─────────────────────┘
+     │
+     ▼
+┌─────────────────────┐
+│ content-repository  │ → Store in MySQL
+└─────────────────────┘
+     │
+     ▼
+┌─────────────────────┐
+│ content-distiller   │ → Summarize & extract
+└─────────────────────┘
+     │
+     ▼
+┌─────────────────────┐
+│ quality-reviewer    │ → QA loop
+└─────────────────────┘
+     │
+     ├── REFACTOR → content-distiller
+     ├── DEEP_RESEARCH → web-crawler
+     │
+     ▼ APPROVE
+┌─────────────────────┐
+│ markdown-exporter   │ → Project files / Fine-tuning
+└─────────────────────┘
+```
+
+## Quality Scoring Thresholds
+
+| Score | Decision | Action |
+|-------|----------|--------|
+| ≥ 0.85 | **Approve** | Ready for export |
+| 0.60-0.84 | **Refactor** | Re-distill with feedback |
+| 0.40-0.59 | **Deep Research** | Gather more sources |
+| < 0.40 | **Reject** | Archive (low quality) |
+
+## Source Credibility Tiers
+
+| Tier | Source Type | Examples |
+|------|-------------|----------|
+| **Tier 1** | Official documentation | docs.anthropic.com, platform.openai.com/docs |
+| **Tier 1** | Official engineering blogs | anthropic.com/news, openai.com/blog |
+| **Tier 2** | Research papers | arxiv.org papers with citations |
+| **Tier 2** | Verified community guides | Official cookbooks, tutorials |
+| **Tier 3** | Community content | Blog posts, Stack Overflow |
+
+## Files in This Project
+
+- `INDEX.md` - This overview file
+- `reference-curator-complete.md` - All 6 skills in one file
+- `01-reference-discovery.md` - Source discovery skill
+- `02-web-crawler.md` - Crawling orchestration skill
+- `03-content-repository.md` - Database storage skill
+- `04-content-distiller.md` - Content summarization skill
+- `05-quality-reviewer.md` - QA review skill
+- `06-markdown-exporter.md` - Export skill
+
+## Usage
+
+Upload all files to a Claude.ai Project, or upload only the skills you need.
+
+For the complete experience, upload `reference-curator-complete.md` which contains all skills in one file.