docs: remove boilerplate parameter/return sections

style: qualify all imports

ci: test against gleam 1.15.2

refactor: reduce wycheproof RSA test boilerplate

refactor: extract certificate builder setup helper

refactor: extract RSA import-sign-verify test helper

refactor: extract shared AEAD negative test helper

refactor: deduplicate TestResult type across wycheproof tests

refactor: deduplicate x509 signature verification and key parsing

refactor: rename abbreviated identifiers

fix: validate key type in ecPublicKeyFromDer

fix: validate EC point encoding on DER/PEM import

docs: document EdDSA public key validation limits

fix: validate RSA components before CRT reconstruction

chore: update dependencies