bug: sandbox denied error logs

[jif-oai]

Check on STDOUT / STDERR or aggregated output for some logs when sanbox is denied

[jif-oai]

@codex fix the tests

[chatgpt-codex-connector]

Summary

• Updated sandbox denied UI messaging to combine stdout and stderr when aggregated text is missing, added explicit stdout-only coverage, and expanded regression tests for the sandbox error message helper. codex-rs/core/src/error.rsL310-L441
• Simplified sandbox denial keyword scanning to check stdout, stderr, and aggregated streams individually without building an intermediate joined buffer. codex-rs/core/src/exec.rsL200-L233

Testing

• ⚠️ cargo test -p codex-core (fails: unable to download crates from crates.io in the sandbox).
• ⚠️ cargo test -p codex-core --offline (fails: cargo still needs the tree-sitter crate while offline).
• ⚠️ just fix -p codex-core (fails: crate download blocked in the sandbox).

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