Use Windows PowerShell in scheduled workflow

.github/workflows/daily-codex-analysis.yml

@@ -51,13 +51,13 @@ jobs:
           python-version: "3.13"
 
       - name: Install TradingAgents
-        shell: pwsh
+        shell: powershell
         run: |
           python -m pip install --upgrade pip
           python -m pip install -e .
 
       - name: Verify Codex login and model availability
-        shell: pwsh
+        shell: powershell
         run: |
           $workspaceDir = Join-Path $env:GITHUB_WORKSPACE ".codex-preflight"
           $script = @(
@@ -75,7 +75,7 @@ jobs:
           $script | python -
 
       - name: Run scheduled analysis and build site
-        shell: pwsh
+        shell: powershell
         run: |
           $configPath = "config/scheduled_analysis.toml"
           if (-not (Test-Path $configPath)) {