Feature: Add support for Poetry test environments

[pradeep0153]

Closes #237.

Description

This PR executes a major compatibility initiative by engineering support for Poetry-based Python repositories. Currently, Repopilot only supported running tests via standard pytest or python -m pytest when working with Python projects.

However, many modern Python projects utilize poetry for dependency management and virtual environment isolation. When Repopilot executed pytest against a Poetry-based repo, the tests failed immediately because the dependencies (which are locked in Poetry's isolated .venv) were not found on the global PATH. The agent was mathematically locked out of modifying thousands of modern Python repositories. We needed to execute a major compatibility initiative by engineering a dynamic Virtual Environment detection pipeline.

Changes Made

• Runner Audit: Updated sandbox.py and the ALLOWED_RUNNERS array to securely support poetry run pytest.
• Heuristic Detection Pipeline: Refactored the SubprocessSandbox to implement a strict heuristic detection algorithm.
• Execution: If the sandbox algorithmically detects a poetry.lock and pyproject.toml in the repository root, it now automatically prepends poetry run to the test command. Furthermore, the DockerSandbox was updated to correctly mount the Poetry cache directory and install dependencies during its initialization phase to guarantee a hermetic test run.

Impact

• Ecosystem Compatibility: Assuming every Python repository uses a global pip environment is a fatal assumption that breaks on modern toolchains. By engineering this Poetry support pipeline, we mathematically eradicate virtual environment conflicts. We drastically expand Repopilot's compatibility, allowing the agent to seamlessly operate on enterprise-grade Python projects with complex dependency trees.

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