v1.4.548

Changes

PR #2293 by pcbeingused333 and ksylvan: fix(codex): return the error of a failed Responses stream and report its usage

• Fixed the Codex plugin so that errors from a failed Responses stream are returned to the caller and the associated usage is reported.
• Returned response failure errors immediately during streaming instead of deferring their handling.
• Included error codes in failure messages when they are available.
• Removed the redundant error helper and its fallback message.
• Added test coverage in internal/plugins/ai/codex/codex_test.go.