feat(agents): add Codex as a first-class harness - #5509

    1 files  ±0     87 suites  ±0   21s ⏱️ -1s
1 357 tests ±0  1 357 ✅ ±0  0 💤 ±0  0 ❌ ±0 
1 359 runs  ±0  1 359 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 18a8bec. ± Comparison against earlier commit 6bd4a21.