check-signaturelisted

Verify signing for one or more `.apk` files. ## Workflow 1. Confirm supplied files exist and are APKs. 2. Locate `apksigner` cross-platform through PATH or Android SDK build-tools locations. 3. Invoke `android-apk-signing-verifier`. 4. Use `apksigner verify --print-certs` when available. 5. Report verification status, signer count and certificate SHA-256 digest where returned. 6. When comparing APKs, state whether the confirmed certificate fingerprints match. 7. Generate an HTML report only when requested. ## Safety Never request or expose keystore passwords or private signing material. Do not claim which Play Console key a certificate represents unless that evidence was separately provided.