fix: port leftover 1817/1829 deltas after PR 1941

[sebrandon1]

Summary

• Port remaining leftovers from closed #1817 / #1829 that were not included when #1941 merged the Ed25519 + P-384 product code
• Strengthen integration with e2e-unique crypto coverage (prefer integration over growing e2e)
• Document e2e vs integration in root README + tests/integration/README.md

Ref: CNF-25515, CNF-26736

Integration tests added / updated

Scenario	Coverage
test_crypto_ecdsa_p384 (via helpers)	Re-enable P-384 openssl verify chain check
test_crypto_jwt_rs256 / es256 / es384 / eddsa	Multi-alg JWT resign + verify (run_jwt_algo_test)
test_crypto_ed25519	Ed25519 CA+leaf regen + chain verify (replaces misleading *_rejected)
test_crypto_standalone_keys	Standalone .key/.pub (RSA PUBLIC KEY + SPKI)

E2E

• Light CI harden only: on failure, upload e2e-failure/ (crypto dir + stderr)
• No Docker/etcd in e2e

Test plan

• cargo test in Docker rust:1.87
• CI rust-ci / cargo-* green
• Integration / e2e green with new scenarios

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[sebrandon1]

/retest

[red-hat-konflux]

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[omertuc]

/lgtm

[omertuc]

/approve

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[sebrandon1]

/retest

[red-hat-konflux]

All PipelineRuns for this commit have already succeeded. Use /retest <pipeline-name> to re-run a specific pipeline or /test to re-run all pipelines.

[openshift-ci]

@sebrandon1: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ipc-e2e-flow	c288bea	link	true	/test ipc-e2e-flow
ci/prow/e2e-aws-ovn-single-node-recert-serial	c288bea	link	true	/test e2e-aws-ovn-single-node-recert-serial
ci/prow/e2e-aws-ovn-single-node-recert-parallel	c288bea	link	true	/test e2e-aws-ovn-single-node-recert-parallel

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[omertuc]

 /test ipc-e2e-flow