fix: simplify release naming to just version tag

- Change release name from "tokenizer-vX.X.X" to "vX.X.X"
- Update release header to "Release vX.X.X"
- Removes redundant project name from release title

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jackspirou

.goreleaser.yaml

@@ -95,9 +95,9 @@ release:
   github:
     owner: agentstation
     name: tokenizer
-  name_template: "{{.ProjectName}}-v{{.Version}}"
+  name_template: "v{{.Version}}"
   header: |
-    ## tokenizer v{{.Version}}
+    ## Release v{{.Version}}
     
     ### Installation