Sync main updates from marioernestovaldes/LAMPrEY

[marioernestovaldes]

Summary

• Sync current documentation updates from the fork.
• Add the QC dashboard's total TMT missing-values metric.
• Outline samples proposed for anomaly flags in the SHAP heatmap.

The TMT metric and anomaly highlighting are separate commits. Python syntax compilation and git diff --check passed; the test suite was not run.