## Summary
- Adds validation to prevent servers from being published with version
string "latest"
- "latest" is now a reserved keyword that cannot be used as a version
string
## Implementation
- Added `ErrReservedVersionString` error constant
- Created `validateVersion` function to check for reserved version
strings
- Integrated validation into the package field validation flow
- Added comprehensive test coverage
---
This is so we can potentially support things like
https://github.com/modelcontextprotocol/registry/discussions/333 in
future more easily, as I imagine we might want to.
41aacc1846