Support OPENAI_BASE_URL routing and JSON parsing

[bpulluta]

Summary

• add OPENAI_BASE_URL and OPENAI_API_KEY env mapping for openai client config
• keep explicit client kwargs precedence for backward compatibility
• add fallback parser for responses that include prose before JSON
• add unit tests for openai config env handling and parsing fallback

Validation

• pixi run -e pdev ruff check compass/llm/config.py compass/utilities/parsing.py tests/python/unit/utilities/test_utilities_parsing.py tests/python/unit/llm/test_config.py
• pixi run -e pdev pytest -q tests/python/unit/utilities/test_utilities_parsing.py tests/python/unit/llm/test_config.py

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.18%. Comparing base (9c17ada) to head (da66d3f).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #453      +/-   ##
==========================================
+ Coverage   56.11%   61.18%   +5.07%     
==========================================
  Files          63       77      +14     
  Lines        6080     6846     +766     
  Branches      591      675      +84     
==========================================
+ Hits         3412     4189     +777     
+ Misses       2598     2542      -56     
- Partials       70      115      +45     

Flag	Coverage Δ
unittests	61.18% <100.00%> (+5.07%)	⬆️

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[Copilot]

Pull request overview

This PR adds OpenAI environment-based client configuration and makes LLM JSON response parsing more tolerant of prose-wrapped JSON, supporting routed OpenAI-compatible endpoints.

Changes:

• Maps OPENAI_API_KEY and OPENAI_BASE_URL into OpenAI client kwargs while preserving explicit kwargs precedence.
• Adds fallback parsing for embedded JSON payloads after strict JSON decoding fails.
• Adds unit tests for OpenAI config env handling and prose-before-JSON parsing.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
compass/llm/config.py	Adds OpenAI env var mapping for client initialization.
compass/utilities/parsing.py	Adds fallback recovery for embedded JSON objects or arrays.
tests/python/unit/llm/test_config.py	Adds tests for OpenAI and Azure client kwargs env handling.
tests/python/unit/utilities/test_utilities_parsing.py	Adds coverage for prose-prefixed JSON parsing.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.