fix: address Copilot review feedback

- Clarify docs wording: "103 explicitly installed top-level packages"
- Add --prefer-binary to pip install to avoid sdist fallbacks

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

docs/python-packages.md

@@ -1,6 +1,6 @@
 # Python package support
 
-The python-agent-driver ships CPython 3.12 with the full standard library and 103 third-party pip packages.
+The python-agent-driver ships CPython 3.12 with the full standard library and 103 explicitly installed top-level pip packages (transitive dependencies are also included).
 
 ## Standard library
 

examples/python-agent-driver/Dockerfile

@@ -10,7 +10,7 @@ ARG BASE=ghcr.io/hyperlight-dev/hyperlight-unikraft/python-base:latest
 
 # Stage 1: Python deps (same as python-agent).
 FROM python:3.12-slim AS deps
-RUN pip install --target=/deps --no-cache-dir \
+RUN pip install --target=/deps --no-cache-dir --prefer-binary \
     tqdm pyyaml jinja2 beautifulsoup4 tabulate click tenacity \
     python-dotenv pypdf openpyxl markdown-it-py pydantic pillow \
     lxml cryptography python-dateutil numpy pandas \