chore: Use _impl variants instead of inline .Call() for five functions with changed C signatures

[Copilot]

Five functions (betweenness, edge_betweenness, cluster_infomap, sample_gnp, rewire_each_edge) were directly calling C functions whose argument counts changed in the new C core version. This caused compatibility issues.

Changes

• betweenness(): Replace inline .Call(R_igraph_betweenness_cutoff, ...) with betweenness_cutoff_impl()
• edge_betweenness(): Replace inline .Call(R_igraph_edge_betweenness_cutoff, ...) with edge_betweenness_cutoff_impl()
• cluster_infomap(): Replace inline .Call(R_igraph_community_infomap, ...) with community_infomap_impl()
• sample_gnp(): Replace inline .Call(R_igraph_erdos_renyi_game_gnp, ...) with erdos_renyi_game_gnp_impl()
• rewire_each_edge(): Replace inline .Call(R_igraph_rewire_edges, ...) with rewire_edges_impl()

The _impl variants handle argument preprocessing and C signature changes, allowing wrapper functions to focus on post-processing logic (normalization, metadata, filtering). Eliminates 81 lines of duplicated preprocessing code.

• Fixes Use _impl variant instead of inline .Call() for four specific functions #2428

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Use _impl variant instead of inline .Call() for four specific functions</issue_title>
<issue_description>These have changed the number of arguments in the new version of the C core.

• betweenness
• cluster_infomap
• sample_gnp
• rewire_each_edge</issue_description>

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

• Fixes Use _impl variant instead of inline .Call() for four specific functions #2428

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[krlmlr]

@copilot: Also add edge_betweenness() .

[Copilot]

@copilot: Also add edge_betweenness() .

Done in 962caec. edge_betweenness() now uses edge_betweenness_cutoff_impl().