Track yanked kuchikikiki 0.9.2 dependency

[lodyai]

Summary

make audit reports yanked crate kuchikikiki 0.9.2.

Current state

• Reported version: kuchikikiki 0.9.2
• Dependency path: readabilityrs 0.1.3 -> kuchikikiki 0.9.2
• The current cargo audit CLI only supports --ignore <ADVISORY_ID>, and
  the yanked warning does not have a RustSec advisory ID in the audit output.

Acceptance criteria

• Upgrade or replace readabilityrs usage so the lockfile no longer resolves
  yanked kuchikikiki 0.9.2.
• Remove the yanked-crate tracking note from the audit policy comments in
  Makefile.
• Run make audit and the normal commit gates successfully.