HBF M0 — Ed25519 device verify

Runs the production verify logic against the bundled stub public key (kid hbf-lic-2026-01) and its committed token. No money, no live key. Expected outcome: import OK, genuine VALID, tampered INVALID → overall PASS.

Running…

1. importKey (JWK alg: "Ed25519")

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2. Genuine token → expect VALID

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3. Tampered token → expect INVALID

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