fix: pre-install runtime deps in verify step

- QPK declares zero dependencies but code uses requests/numpy/pandas
- Install required packages before testing QPK imports

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

Author: Pigbibi

.github/workflows/update-qpk-pin.yml

@@ -50,6 +50,8 @@ jobs:
           set -euo pipefail
           echo "::group::Verifying packages installable with new constraints"
           python -m pip install --upgrade pip
+          # Pre-install runtime deps QPK needs but doesn't declare as dependencies
+          python -m pip install requests numpy pandas
           # Install QPK WITHOUT constraints (avoids self-referencing SHA conflict)
           python -m pip install -e .
           python -c "import quant_platform_kit; print('QPK import OK')"