Name the checkpoint behind the #1042 status link

[jwr404]

Summary

• The historical section "Historical status through Conditional κ = 0.001672188119205421: improved T16 owner packing on the seven-slot k8 word #1042" prints 0.001672188119205421 and links Selected record to certificates/selected-result.json.
• That file carries the live kappa 836330098538459/500000000000000000. The printed decimal is certificates/checkpoints/frontier1042.json, which the live record names as previous_record.
• The status page is unchanged, and the selected exponent is unchanged.

Test plan

• python3.12 -B research/historical-1042-link/verify.py
• python3.12 -B research/historical-1042-link/test_verify.py
• python3.12 -B scripts/research_package.py --package research/historical-1042-link
• Confirm the registered replay on the maintainer's Python 3.12 checkout

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