feat(tests): add onboarding test script

[fcogidi]

Summary

Aligns proxy credential env vars with the bootcamp secret manager (PROXY_* → OPENAI_*), adds a repo-root onboarding integration test suite for live credential verification, and updates setup docs/notebooks to explain the Coder vs local credential model and the onboard CLI workflow.

Clickup Ticket(s): Link(s) if applicable.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Test improvements
• 🔒 Security fix

Changes Made

• Env var rename (breaking): PROXY_BASE_URL / PROXY_API_KEY → OPENAI_BASE_URL / OPENAI_API_KEY across the library (AgentConfig, LLMPredictorConfig), implementations, playground scripts, and docs — matching names injected by aieng-platform-onboard from the secret manager
• Onboarding integration tests: new tests/test_integration.py with live checks for Vector proxy LLM inference, Langfuse auth, and E2B code execution; shared helpers in tests/conftest.py; integration_test pytest marker registered in pyproject.toml
• Docs & UX: README gains a Coder workspace / bootcamp environment section with onboard commands; .env.example clarifies which keys are shell-injected vs .env-local; 00_environment_check.ipynb updated with setup instructions and the new env var names; planning-docs/vector-llm-proxy.md updated
• Dependencies: aieng-platform-onboard>=0.7.2 in root dev deps; aieng-agents[code-interpreter] minimum bumped to >=0.3.1

Testing

• Tests pass locally (uv run pytest tests/)
• Type checking passes (uv run mypy <src_dir>)
• Linting passes (uv run ruff check src_dir/)
• Manual testing performed (describe below)

Manual testing details:

• eval "$(onboard --bootcamp-name agentic-forecasting --test-script tests/test_integration.py)" passes all three integration checks
• uv run pytest tests/test_integration.py -v passes with onboard-injected keys
• 00_environment_check.ipynb runs top-to-bottom on Coder and locally
• Unit tests still pass with integration tests excluded: uv run pytest -m "not integration_test" tests implementations/tests

Screenshots/Recordings

N/A

Related Issues

Deployment Notes

Breaking change for local setups: rename PROXY_BASE_URL / PROXY_API_KEY to OPENAI_BASE_URL / OPENAI_API_KEY in any existing .env files. Code that passed proxy_base_url / proxy_api_key to AgentConfig or LLMPredictorConfig must use openai_base_url / openai_api_key instead.

On Coder workspaces, bootcamp keys are injected into the shell by onboarding. Only personal keys (e.g. FRED_API_KEY) belong in .env.

Checklist

• Code follows the project's style guidelines
• Self-review of code completed
• Documentation updated (if applicable)
• No sensitive information (API keys, credentials) exposed