Alias stdlib errors import to avoid ambiguity in pkg/errors

[Copilot]

In a package named errors, unaliased stdlib errors imports make call sites ambiguous—errors.Join(...) could refer to either the package or stdlib.

Changes

• Aliased stdlib import as stderrors in pkg/errors/error_capture.go and pkg/errors/error_capture_test.go
• Updated errors.Join() → stderrors.Join() and errors.New() → stderrors.New()

import (
	stderrors "errors"
	"fmt"
)

// Now unambiguous
*rErr = stderrors.Join(*rErr, err)

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[gwossum]

LGTM