Test material for t/02-key.t and t/06-abi.t. Public by construction: these
are throwaway self-signed certificates and their private keys, generated
once on 2026-09-08 and committed so the suite is deterministic. They are
not credentials, they guard nothing, and they must never be regenerated -
a test that regenerates its own vectors proves only that the generator
agrees with itself.

The certificates expire in 2126. Nothing in Crypt::JWS reads a validity
date, so an expired one would not fail the suite, but a long life keeps
that true if a caller ever starts checking.

Generated with:

  openssl req -x509 -newkey rsa:2048 \
      -keyout test-rsa-key.pem -out test-rsa-cert.pem \
      -days 36500 -nodes -subj "/CN=Crypt-JWS test RSA"

  openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:prime256v1 \
      -keyout test-ec-key.pem -out test-ec-cert.pem \
      -days 36500 -nodes -subj "/CN=Crypt-JWS test EC"

Both key types are here because cjws_key_classify branches on RSA and EC
and a certificate of one type exercises only one of them.
