- Rename binary from host-mcp to workspace-mcp
- Rename src/bin/host_mcp.rs to src/bin/workspace_mcp.rs
- Update tool prefix from host_* to workspace_*
- Update MCP registration name from "host" to "workspace"
- Add "Builtin" tag to UI for workspace and desktop MCPs
- Update documentation (CLAUDE.md, INSTALL.md, docs-site)
The "workspace MCP" name better reflects that it runs in the
workspace's execution context - inside containers for container
workspaces, on host for host workspaces.
cb36560526