feat: add per-step metrics collection and rendering (#203)

* feat: add per-step metrics collection and rendering

Fetch workflow jobs via Octokit API and split collected metrics by each
step's time range. Render per-step charts under collapsible <details>
tags alongside the existing "All" chart.

- Add github_token input to action.yml
- Add @octokit/action and @actions/github dependencies
- Restructure render data model: split metricsInfoList into separate
  legends and stackedBarData to support multiple charts per section
- Add formatChartHeader/Footer for step-level <details> wrapping
- Add n/no-unpublished-import ESLint rule with ignoreTypeImport
- Update README (EN/JA) with per-step metrics documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix format (#204)

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---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 3 people

README.ja.md

@@ -11,6 +11,7 @@
 ## 機能
 
 - **システムメトリクス収集**: ワークフロー実行中のCPU負荷とメモリ使用量をリアルタイムで収集
+- **ステップ別メトリクス**: GitHub APIを使用してワークフローの各ステップごとにメトリクスを分割
 - **Mermaidチャート生成**: 収集したメトリクスをMermaid形式の積み上げ棒グラフとして可視化
 - **ジョブサマリー出力**: GitHub Actionsのジョブサマリーに自動的にチャートを表示
 
@@ -52,6 +53,8 @@ jobs:
       # ワークフローの先頭でactions-workflow-metricsを実行
       - name: Start Workflow Telemetry
         uses: dev-hato/actions-workflow-metrics@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
 
       # 以降の通常のステップ
       - name: Checkout
@@ -78,6 +81,7 @@ jobs:
   - `systeminformation`: システムメトリクス収集
   - `zod`: スキーマバリデーション
   - `@actions/core`: GitHub Actions連携
+  - `@octokit/action`: ステップ別メトリクス取得用GitHub APIクライアント
 
 ## 開発セットアップ
 

README.md

@@ -7,6 +7,7 @@ A GitHub Actions for collecting system metrics during workflows and outputting M
 ## Features
 
 - **System Metrics Collection**: Collects CPU load and memory usage in real-time during workflow execution
+- **Per-Step Metrics**: Breaks down metrics for each workflow step using the GitHub API
 - **Mermaid Chart Generation**: Visualizes collected metrics as Mermaid stacked bar charts
 - **Job Summary Output**: Automatically displays charts in GitHub Actions job summary
 
@@ -48,6 +49,8 @@ jobs:
       # Run actions-workflow-metrics at the beginning of the workflow
       - name: Start Workflow Telemetry
         uses: dev-hato/actions-workflow-metrics@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
 
       # Subsequent regular steps
       - name: Checkout
@@ -74,6 +77,7 @@ jobs:
   - `systeminformation`: System metrics collection
   - `zod`: Schema validation
   - `@actions/core`: GitHub Actions integration
+  - `@octokit/action`: GitHub API client for per-step metrics
 
 ## Development Setup
 

action.yml

@@ -4,6 +4,10 @@ description: "A GitHub Actions for collecting system metrics during workflows an
 branding:
   color: green
 inputs:
+  github_token:
+    description: "GitHub access token"
+    default: ${{ github.token }}
+    required: false
   interval_seconds:
     description: "Interval between metrics collection in seconds"
     default: "5"