Constant UNTRACKED_KCONFIG_EXPLANATION 

pub const UNTRACKED_KCONFIG_EXPLANATION: &str = "(untracked kconfig) marks entries with no recorded ktstr.kconfig hash \
     (pre-dates kconfig hash tracking). Rebuild with: kernel build --force --kernel VERSION \
     (add --extra-kconfig PATH if the original entry was built with a user fragment).";

Explanation of the (untracked kconfig) tag. Consumer-facing wording mirrors EOL_EXPLANATION’s “one-const, one-surface” pattern so a doc-drift between the tag word and the legend cannot silently slip. Mirrors STALE_KCONFIG_EXPLANATION so the kconfig tag pair shares one shape.

The (corrupt) tag is deliberately not in this legend family — its remediation is operational, not informational. See format_corrupt_footer for the full rationale.