Reject non-canonical badge encodings in Verify#25
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Scrub hardening (info-level, defense-in-depth). Verify now re-encodes the parsed badge via Canonical and rejects any input that doesn't round-trip (leading zeros, '+' signs, etc.) before checking the signature — foreclosing byte-string-vs-parsed-fields malleability for downstream consumers. The issuer always signs the canonical form, so production badges are unaffected (golden vectors still pass). Test added.