chore: Replace _impl alias with explicit wrapper in R/coloring.R

[Copilot]

Replaces direct function aliasing with an explicit wrapper that forwards arguments individually.

Changes:

• Converts greedy_vertex_coloring <- vertex_coloring_greedy_impl to an explicit wrapper function
• Uses arg = arg notation for argument forwarding
• Preserves function signature and default values

Before:

greedy_vertex_coloring <- vertex_coloring_greedy_impl

After:

greedy_vertex_coloring <- function(graph, heuristic = c("colored_neighbors", "dsatur")) {
  vertex_coloring_greedy_impl(
    graph = graph,
    heuristic = heuristic
  )
}

This makes the public API interface explicit and improves code maintainability without changing behavior.

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Original prompt

---

This section details on the original issue you should resolve

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

Functions to update:

• greedy_vertex_coloring <- vertex_coloring_greedy_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/coloring.R</issue_description>

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

• Fixes Replace _impl aliases in R/coloring.R #2338

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