feat: add MCPB bundle and fix npm package distribution

Two distribution methods now available:

1. npm (for Claude Code / developers):
   npm install -g vestige-mcp-server
   claude mcp add vestige vestige-mcp -s user

2. MCPB (for Claude Desktop / one-click install):
   Download vestige-1.1.0.mcpb from releases, double-click

Changes:
- Renamed npm package to vestige-mcp-server (vestige-mcp was taken)
- Fixed postinstall to download binaries from GitHub releases
- Added vestige-mcpb package with manifest and build script
- Uploaded .mcpb bundle to v1.1.0 release

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

packages/vestige-mcpb/README.md

@@ -0,0 +1,38 @@
+# Vestige MCPB
+
+One-click installation bundle for Claude Desktop.
+
+## For Users
+
+1. Download `vestige-1.1.0.mcpb` from [GitHub Releases](https://github.com/samvallad33/vestige/releases)
+2. Double-click to install
+3. Restart Claude Desktop
+
+That's it. No npm, no terminal, no config files.
+
+## For Developers
+
+### Building the bundle
+
+```bash
+# Install mcpb CLI
+npm install -g @anthropic-ai/mcpb
+
+# Download binaries from GitHub release
+./build.sh
+
+# Pack
+mcpb pack
+```
+
+### Structure
+
+```
+vestige-mcpb/
+├── manifest.json        # Bundle metadata
+├── server/              # Platform binaries (downloaded)
+│   ├── vestige-mcp-darwin-arm64
+│   ├── vestige-mcp-linux-x64
+│   └── vestige-mcp-win32-x64.exe
+└── vestige-1.1.0.mcpb   # Final bundle (generated)
+```