fix: correct ldflags in GoReleaser configuration

- Change ldflags to use main package instead of full path
- Update variable names to match main.go declarations
- Use {{.Runtime.Goversion}} for Go version

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

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

Author: jackspirou

.goreleaser.yaml

@@ -34,10 +34,10 @@ builds:
         goarch: arm
     ldflags:
       - -s -w
-      - -X github.com/agentstation/tokenizer/cmd/tokenizer.version={{.Version}}
-      - -X github.com/agentstation/tokenizer/cmd/tokenizer.commit={{.Commit}}
-      - -X github.com/agentstation/tokenizer/cmd/tokenizer.date={{.Date}}
-      - -X github.com/agentstation/tokenizer/cmd/tokenizer.builtBy=goreleaser
+      - -X main.version={{.Version}}
+      - -X main.commit={{.Commit}}
+      - -X main.buildDate={{.Date}}
+      - -X main.goVersion={{.Runtime.Goversion}}
 
 archives:
   - id: tokenizer