[codex] Clean up CI docs and legacy naming

[ScriptedAlchemy]

Summary

• removes legacy TokenSave docs/scripts and stale benchmark artifacts
• updates CI Cargo concurrency behavior and embedded dashboard artifact checks
• refreshes docs and rebrand references for TraceDecay-only naming

Validation

• cargo fmt --all -- --check
• cargo check --workspace on each stack branch
• cargo test --workspace on the top of the stack

[changeset-bot]

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Latest commit: 1218645

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[chatgpt-codex-connector]

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