`crewai run` runs a JSON crew in a fresh `uv run python -c` interpreter that
never imports cli.py, and `_run_json_crew` loads the project's .env with
override=True before tracing first imports crewai_core.plus_api, so the pin
recorded the project's proxy and CA. The runner now imports plus_api before
anything else. Declarative flows re-run through `uv run crewai run`, which
already pins in cli.py.
Also keeps `_requests_sent_by` off machine and OS proxies, so a developer's
proxy can't mount a real transport ahead of its MockTransport.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>