Fix/sdk ci workflow

.github/workflows/sdk-ci.yml

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+# GitHub Actions CI Workflow for SDK Build Checks
+
+name: SDK CI
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'packages/sdk/**'
+      - '.github/workflows/sdk-ci.yml'
+
+jobs:
+  build:
+    name: Build and Validate SDK
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v3
+        with:
+          version: 8.10.0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18.x'
+          cache: 'pnpm'
+
+      - name: Install Dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build SDK
+        run: pnpm --filter susuchain-sdk build

docs/SDK_CI.md

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+# GitHub Actions CI Workflow for SDK Build Checks
+
+This document details the architectural design and setup of the Continuous Integration (CI) pipeline configured to automatically validate the SDK build.
+
+## Requirements
+
+1. **Automation**: Run verification checks automatically on every pull request targeting the `main` branch.
+2. **Path Filtering**: Trigger only when code under `packages/sdk` or the workflow configuration itself changes.
+3. **Correctness**: Build the SDK using Node.js and the designated package manager (`pnpm`).
+4. **Performance**: Utilize package manager cache configurations to minimize build and execution latency.
+
+## Architecture
+
+- **CI Runner**: `ubuntu-latest`
+- **Node.js Version**: Defined in configuration to match workspace specification.
+- **Package Manager**: `pnpm` (configured with lockfile checking and dependency cache store restoration).
+- **Execution Script**: `pnpm --filter susuchain-sdk build`