Prerelease 0.7.2-alpha1 (#278)

## Motivation and Context
- test new publish plugin
- add package.kt to kotlin-sdk umbrella module to resolve klib
generation errors during Maven publishing


## Breaking Changes
no

## Types of changes
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

buildSrc/src/main/kotlin/mcp.publishing.gradle.kts

@@ -5,7 +5,6 @@ plugins {
 }
 
 mavenPublishing {
-    signAllPublications()
     publishToMavenCentral(automaticRelease = true)
 
     pom {