fix: resolve CI workflow issues

- Remove duplicate lint job definition
- Fix codecov action parameters (file -> files)
- Add slug parameter to codecov action
- Update README codecov badge with token for visibility

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

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

Author: jackspirou

.github/workflows/ci.yaml

@@ -99,25 +99,10 @@ jobs:
       uses: codecov/codecov-action@v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
-        file: ./coverage.txt
+        files: ./coverage.txt
         flags: unittests
         name: codecov-umbrella
-
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Set up Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: '1.24'
-
-    - name: Run golangci-lint
-      uses: golangci/golangci-lint-action@v8
-      with:
-        version: latest
-        args: --timeout=5m
+        slug: agentstation/tokenizer
 
   build:
     runs-on: ubuntu-latest

README.md

@@ -3,7 +3,7 @@
 [![GoDoc](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://pkg.go.dev/github.com/agentstation/tokenizer)
 [![Go Report Card](https://goreportcard.com/badge/github.com/agentstation/tokenizer?style=flat-square)](https://goreportcard.com/report/github.com/agentstation/tokenizer)
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/agentstation/tokenizer/ci.yaml?style=flat-square)](https://github.com/agentstation/tokenizer/actions)
-[![codecov](https://codecov.io/gh/agentstation/tokenizer/branch/master/graph/badge.svg)](https://codecov.io/gh/agentstation/tokenizer)
+[![codecov](https://codecov.io/gh/agentstation/tokenizer/graph/badge.svg?token=EDNFP6DQLW)](https://codecov.io/gh/agentstation/tokenizer)
 [![License](http://img.shields.io/badge/license-mit-blue.svg?style=flat-square)](https://raw.githubusercontent.com/agentstation/tokenizer/master/LICENSE)
 
 A collection of high-performance tokenizer implementations in Go with a unified CLI interface.