Select the official client local-daemon transport

[cbusillo]

Summary

• stop passing a non-empty CODEX_CLI_PATH, which current ChatGPT treats as a stdio override
• neutralize launchd-level CLI overrides with explicit empty values
• require ChatGPT's own bounded log to prove websocket initialize success
• distinguish transient app-server daemon version probes from serving stdio app-servers
• apply one bounded launch/poll deadline plus a five-second stability window

Validation

• uv run python -m unittest discover -s codex_lab_package -p 'test_*.py' (68 passed)
• just fmt
• static package smoke on the signed clean candidate
• live ChatGPT 26.715.70719 canary: PID 2517, managed app-server PID 4564, transportKind=websocket, no serving stdio child, five-second stability proof

Corrects the local transport gate introduced in #458. Relates to #385.