huskies: merge 1110 story Chat bootstrap Phase 2b: additional stack overlays (Go, Python, Ruby, JVM)

docker/stacks/python/Dockerfile.fragment

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+# Python stack overlay fragment.
+#
+# Layer this on top of huskies-project-base to produce a project container
+# with Python 3, pip, and pyright (the Microsoft Python LSP / type checker).
+#
+# Build the combined image:
+#   (echo "FROM huskies-project-base"; \
+#    cat docker/stacks/python/Dockerfile.fragment) | \
+#   docker build -t huskies-project-python -
+#
+# Adding a new stack: create docker/stacks/<name>/Dockerfile.fragment and
+# docker/stacks/<name>/markers — no changes to orchestration code required.
+
+USER root
+
+# Python 3 runtime and pip.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        python3 \
+        python3-pip \
+    && rm -rf /var/lib/apt/lists/*
+
+# pyright: Microsoft's Python language server / static type checker.
+# --break-system-packages is required on Debian 12+ where pip is externally
+# managed; the flag is safe inside a Docker container.
+RUN pip install --no-cache-dir --break-system-packages pyright
+
+USER huskies

docker/stacks/python/markers

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+# Stack detection markers for the python stack.
+# Each non-blank, non-comment line names a file relative to the project root.
+# If any listed file exists in the project directory, this stack is matched.
+pyproject.toml
+requirements.txt
+setup.py