fix: correct changeset package reference to workspace package (#174)

## Summary

The `fix-cross-version-sig-verify` changeset incorrectly referenced
`@resciencelab/agent-world-sdk` which is not a workspace package
recognized by changesets. This caused the release workflow
(`changesets/action`) to fail with:

```
Error: Found changeset fix-cross-version-sig-verify for package @resciencelab/agent-world-sdk which is not in the workspace
```

Changed the package reference to `@resciencelab/agent-world-network`
(the root workspace package).

Fixes the release workflow failure in
https://github.com/ReScienceLab/agent-world-network/actions/runs/23527121322/job/68482839337

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: Jing-yilin

.changeset/fix-cross-version-sig-verify.md

@@ -1,5 +1,5 @@
 ---
-"@resciencelab/agent-world-sdk": patch
+"@resciencelab/agent-world-network": patch
 ---
 
 Fix cross-version HTTP signature verification: use sender's X-AgentWorld-Version header instead of local PROTOCOL_VERSION when reconstructing signing input, so gateway and peers running different SDK minor versions can still verify each other's signatures.