Add ChatCrystal to Tools catalog

[ZengLiangYi]

Adds ChatCrystal to the Tools catalog as an MCP Server.

ChatCrystal is a local-first knowledge base for AI coding conversations. It imports conversations from Claude Code, Cursor, Codex CLI, Trae, and GitHub Copilot, distills them into searchable notes, and exposes recall/search/writeback tools through a stdio MCP server.

This replaces the earlier skill-based submission after review feedback that ChatCrystal is better represented as an external tool/MCP server than as standalone skills.

Validation run locally:

• npm install
• npm install in website/
• npm run website:build

[github-actions]

🔍 Skill Validator Results

✅ All checks passed

Scope	Checked
Skills	3
Agents	1
Total	4
Severity	Count
---	---:
❌ Errors	0
⚠️ Warnings	0
ℹ️ Advisories	0

Summary

Level	Finding
ℹ️	Found 3 skill(s)
ℹ️	[chatcrystal-debug-recall] 📊 chatcrystal-debug-recall: 608 BPE tokens [chars/4: 677] (detailed ✓), 5 sections, 1 code blocks
ℹ️	[chatcrystal-task-recall] 📊 chatcrystal-task-recall: 603 BPE tokens [chars/4: 658] (detailed ✓), 5 sections, 1 code blocks
ℹ️	[chatcrystal-task-writeback] 📊 chatcrystal-task-writeback: 843 BPE tokens [chars/4: 905] (detailed ✓), 5 sections, 1 code blocks
ℹ️	✅ All checks passed (3 skill(s))

Full validator output

```text Found 3 skill(s) [chatcrystal-debug-recall] 📊 chatcrystal-debug-recall: 608 BPE tokens [chars/4: 677] (detailed ✓), 5 sections, 1 code blocks [chatcrystal-task-recall] 📊 chatcrystal-task-recall: 603 BPE tokens [chars/4: 658] (detailed ✓), 5 sections, 1 code blocks [chatcrystal-task-writeback] 📊 chatcrystal-task-writeback: 843 BPE tokens [chars/4: 905] (detailed ✓), 5 sections, 1 code blocks ✅ All checks passed (3 skill(s)) ```

[aaronpowell]

I've not heard of ChatCrystal and these skills seem to expect that there's some external tool installed to use, so I'm not sure this is a good fit for this repo.

[ZengLiangYi]

Thanks, that makes sense. I agree these are better represented as an external tool/MCP server rather than three standalone skills.

I’ll update this PR to remove the skill files and add ChatCrystal to the Tools catalog as an MCP Server entry, with explicit requirements, links, and stdio MCP configuration.