docs: clean up public repo — remove IDE files, fix stale refs

- Untrack .claude/commands/ and .windsurf/workflows/ (personal IDE config)
- Fix .gitignore: scope /CLAUDE.md to root only, add .claude/, remove
  incorrect .github/workflows/ exclusion (CI needs these tracked)
- Rename docs/ANTIGRAVITY.md → docs/CLAUDE.md (Claude Desktop setup;
  "Antigravity" was an internal codename, confusing to public users)
- Fix stale repo name: masdevid/mt5-mcp → masdevid/mt5-quant in
  README.md, docs/CLAUDE.md, CURSOR.md, QUICKSTART.md, VSCODE.md, WINDSURF.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/QUICKSTART.md

@@ -6,19 +6,19 @@
 
 ```bash
 # macOS (Apple Silicon)
-curl -L -o mt5-quant.tar.gz https://github.com/masdevid/mt5-mcp/releases/latest/download/mt5-quant-macos-arm64.tar.gz
+curl -L -o mt5-quant.tar.gz https://github.com/masdevid/mt5-quant/releases/latest/download/mt5-quant-macos-arm64.tar.gz
 tar -xzf mt5-quant.tar.gz
 
 # Linux (x64)
-curl -L -o mt5-quant.tar.gz https://github.com/masdevid/mt5-mcp/releases/latest/download/mt5-quant-linux-x64.tar.gz
+curl -L -o mt5-quant.tar.gz https://github.com/masdevid/mt5-quant/releases/latest/download/mt5-quant-linux-x64.tar.gz
 tar -xzf mt5-quant.tar.gz
 ```
 
 ### Option B: Build from Source
 
 ```bash
-git clone https://github.com/masdevid/mt5-mcp
-cd mt5-mcp
+git clone https://github.com/masdevid/mt5-quant
+cd mt5-quant
 bash scripts/build-rust.sh
 ```
 
@@ -137,7 +137,7 @@ Add to `.vscode/mcp.json` in your workspace:
 
 Or run `MCP: Add Server` from Command Palette.
 
-### Antigravity
+### Claude Desktop
 
 1. Open Agent panel → Click "..." menu → MCP Servers
 2. Click "Manage MCP Servers"
@@ -153,7 +153,7 @@ Or run `MCP: Add Server` from Command Palette.
   }
 }
 ```
-5. Reload Antigravity to apply changes
+5. Restart Claude Desktop to apply changes
 
 ## 5. Verify Setup