fix: resolve outdated function signature in test_e2e.py and configure pytest suite

[archittmittal]

Resolves #62. This PR updates test_e2e.py to match the current function signature of run_agent_loop, refactors test_fs_api.py and test_ws.py to use pytest, adds test_agents_unit.py for agent node unit tests, and adds pytest runner step to Backend CI. Under professionalism constraints, no emojis have been used in code, commit, or PR details.

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📥 Commits

Reviewing files that changed from the base of the PR and between ed03cf7 and 05dc8d9.

📒 Files selected for processing (14)

• .github/workflows/ci-backend.yml
• .github/workflows/greetings.yml
• .github/workflows/pr-size-labeler.yml
• ISSUES.md
• backend/agents.py
• backend/pytest.ini
• backend/requirements.txt
• backend/test_agents_unit.py
• backend/test_e2e.py
• backend/test_fs_api.py
• backend/test_ws.py
• generate_ppt.py
• patch_comments.py
• test_groq.py

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