[DOCKER SEEDING] Add Docker config and run scripts

.helix/Dockerfile.helix

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+FROM python:3.14-slim
+
+WORKDIR /workspace
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    ca-certificates \
+    curl \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN git config --unset-all http.https://github.com/.extraheader || true
+
+RUN python -m pip install --no-cache-dir "poetry==2.1.3" && \
+    poetry config virtualenvs.create false
+
+COPY . /workspace
+
+RUN poetry lock --no-interaction --no-ansi
+RUN poetry install --no-interaction --no-ansi

.helix/metadata.json

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+[{"instance_id":"handshake","task_title":"handshake","problem_statement":"","hints":"","repo":"handshake","repo_path_or_url":"handshake","FAIL_TO_PASS":"","PASS_TO_PASS":"","language":"handshake","docker_file":"handshake","run_script":"handshake","task_type":"handshake","task_category":"handshake","repo_category":"handshake","version":"handshake","container_mem":"handshake","container_memswap":"handshake","container_network_needed":"handshake"}]

.helix/run-tests-eval.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+if [ $# -eq 0 ]; then
+  pytest
+  exit 0
+fi
+
+IFS=',' read -r -a files <<< "$1"
+pytest "${files[@]}"