Resolve Python CodeQL quality alerts

[Liang-Chun Tsai (ltsai-dev)]

Summary

• remove all six imports reported by py/unused-import
• correct tests that patched accidental module-level imports
• resolve the remaining actionable Python CodeQL findings for redundant assignments, empty exception handlers, overly broad BaseException catches, unused test variables, and an unnecessary lambda
• preserve retry and cleanup behavior while making intentionally ignored exceptions explicit

Addresses code-scanning alerts #1-#7 and #41-#58. OpenSSF Scorecard findings are intentionally excluded because they concern repository policy, workflow pinning, fuzzing, and project governance rather than Python code defects.

Validation

• all changed Python files compile successfully
• git diff --check
• focused code review found no remaining actionable issues

Local pytest and pre-commit execution remain unavailable because the environment cannot download missing dependencies due to a PyPI TLS handshake failure; CI runs both checks.

[Copilot]

Pull request overview

This PR cleans up Python files by removing six unused imports that were flagged by CodeQL (py/unused-import), with the stated intent of keeping runtime behavior unchanged.

Changes:

• Removed an unused logging import from the test runner utility.
• Removed unused ssl and Path imports from the base LLM session module.
• Removed unused imports/constants from AOAI session and test utilities (httpx, USER_PROMPT_TPL, json).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
thinkingbox/common/testrunner.py	Drops an unused logging import.
thinkingbox/common/llm_session_base.py	Drops unused ssl and Path imports.
thinkingbox/common/aoai_responses_session.py	Drops an unused httpx import and cleans up spacing.
tests/test_rubrics_judge.py	Drops an unused USER_PROMPT_TPL import from the test module.
tests/mcp_test_tool.py	Drops an unused json import from the MCP test tool.

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