Record completion of first corrected Muon pair

[qcznlp]

Summary

• record both first-pair Muon runs as deeply complete at 3907/3907
• add immutable full-run Hugging Face backup receipts for 101 files per run
• refresh the artifact-only 6/12 progress snapshot and read-only W&B audit
• document the automatic handoff to the second Muon pair

Verification

• 20 focused tests passed
• portable paper evidence audit: 2,785 files / 107,442,256 bytes / complete
• JSON validation and git diff check passed

The manuscript remains gated on the full corrected matrix; this PR makes no scientific claim from partial results.