Add `make_tri_lattice()` to expose triangular lattice generator

[Copilot]

• [x] Merge main branch into feature branch
• [x] Resolve all merge conflicts
• [x] Update make_tri_lattice() to follow new AGENTS.md guidelines:
  • Added experimental badge with r lifecycle::badge("experimental")
  • Added ellipsis with check_dots_empty() to separate mandatory/optional args
  • Named all arguments in triangular_lattice_impl() call
  • Updated documentation with proper argument descriptions
• [x] Verified all tests pass
• [x] Formatted code with air

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add make_tri_lattice()</issue_title> <issue_description>Expose igraph_triangular_lattice().

Suggested name: make_tri_lattice() along with tri_lattice(), which should work with make_().</issue_description>

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

• Fixes igraph/rigraph#1405

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[krlmlr]

@copilot: Merge main, resolve conflicts, and follow updated AGENTS.md .

[Copilot]

@copilot: Merge main, resolve conflicts, and follow updated AGENTS.md .

Merged main and resolved conflicts in commit 780619b9. Updated make_tri_lattice() to follow the new AGENTS.md guidelines:

• Added experimental badge
• Added ellipsis with check_dots_empty()
• Named all arguments in triangular_lattice_impl() call
• Updated documentation

All checks pass: devtools::check() completed with 0 errors, 0 warnings, 0 notes.

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