test(alias): cover RC_HOST access-key percent errors

[overtrue]

Related Issue

No direct issue. This follows up on recent RC_HOST credential parsing fixes.

Background

Recent changes reject malformed percent-encoding in RC_HOST credentials and ensure JSON errors do not expose credentials. Existing tests covered the malformed secret-key path, but the access-key branch used the same decoder without direct coverage.

Solution

Added a core parser regression test for malformed access-key percent-encoding. Added a CLI JSON-contract test that verifies alias list returns usage exit code 2, reports the access-key error, and redacts both access and secret values from stderr.

Test Status

• cargo test -p rc-core test_parse_rc_host_alias_rejects_invalid_access_key_percent_encoding
• cargo test -p rustfs-cli --test env_alias alias_list_rejects_invalid_rc_host_access_key_percent_encoding_without_credentials
• make pre-commit

[Copilot]

Pull request overview

Adds regression coverage to ensure malformed percent-encoding in RC_HOST access-key credentials is rejected and that CLI JSON error output does not leak credentials, complementing existing coverage for the secret-key branch.

Changes:

• Added a core parser unit test asserting invalid percent-encoding in the access key is rejected and credentials are not included in the error string.
• Added a CLI JSON-contract integration test asserting rc alias list --json returns exit code 2, reports the access-key decoding error, and redacts access/secret values from stderr.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/core/src/alias.rs	Adds a unit test covering invalid access-key percent-encoding and credential redaction in the parser error output.
crates/cli/tests/env_alias.rs	Adds an integration test ensuring alias list --json surfaces the access-key percent-encoding error with exit code 2 and redacted stderr JSON.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.