feat(KB-331): rename package to @gsxdsm/fusion

- Rename package from @gsxdsm/kb to @gsxdsm/fusion in package.json and metadata
- Update all documentation references (README, RELEASING, STANDALONE, AGENTS.md)
- Update root workspace scripts for new package name
- Update changeset files to reference @gsxdsm/fusion and @fusion/dashboard
- Update CHANGELOG.md with new package name references

README.md

@@ -707,7 +707,7 @@ Packages are published to npm automatically via GitHub Actions and [changesets](
 ### Installing from npm
 
 ```bash
-npm install -g kb
+npm install -g @gsxdsm/fusion
 ```
 
 ### Triggering a release