refactor: Replace _impl aliases with explicit wrapper functions in R/simple.R

[Copilot]

Replaces direct function aliasing (func <- func_impl) with explicit wrapper functions that forward arguments individually.

Changes:

• simplify(): Now explicitly forwards graph, remove.multiple, remove.loops, and edge.attr.comb to simplify_impl()
• is_simple(): Now explicitly forwards graph to is_simple_impl()

Both wrappers use arg = arg notation for explicit argument forwarding without ....

Before:

simplify <- simplify_impl
is_simple <- is_simple_impl

After:

simplify <- function(graph, remove.multiple = TRUE, remove.loops = TRUE, edge.attr.comb = igraph_opt("edge.attr.comb")) {
  simplify_impl(
    graph = graph,
    remove.multiple = remove.multiple,
    remove.loops = remove.loops,
    edge.attr.comb = edge.attr.comb
  )
}

is_simple <- function(graph) {
  is_simple_impl(graph = graph)
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Replace _impl aliases in R/simple.R</issue_title>
<issue_description>Goal
Review the code in R/simple.R and replace all direct _impl function aliases with explicit wrapper functions.

Functions to update:

• simplify <- simplify_impl
• is_simple <- is_simple_impl

Instructions

1. Review the code to understand the function signatures
2. Create explicit wrapper functions that forward to the _impl functions
3. Forward each argument individually and explicitly using arg = arg notation
4. Do not use ... unless the _impl function itself uses ...

Pattern
Replace direct aliasing like:

func_name <- func_name_impl

With an explicit wrapper:

func_name <- function(arg1, arg2, ...) {
  func_name_impl(
    arg1 = arg1,
    arg2 = arg2,
    ...
  )
}

File
R/simple.R</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Replace _impl aliases in R/simple.R #2357

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