htna 0.1.0

• Initial release.
• Builds heterogeneous transition networks for sequences mixing two or more actor groups (e.g. Human and AI) within the same interaction, via build_htna().
• Re-exports the most commonly used Nestimate and cograph downstream functions under _htna-suffixed aliases so callers do not need to attach Nestimate or cograph explicitly: permutation_htna(), casedrop_reliability_htna(), markov_order_test_htna(), mosaic_plot_htna(), state_distribution_htna(), state_frequencies_htna(), association_rules_htna(), sequence_compare_htna().
• htna-side wrappers add ergonomics over the upstream API: frequencies_htna(), plot_frequencies_htna() (treemap / bars / facet views), centralities_htna(), plot_centralities(), plot_htna(), plot_htna_bootstrap(), plot_htna_diff(), sequence_plot_htna(), reliability_htna(), centrality_stability_htna(), edge_betweenness_htna(), extract_meta_paths() (state-level by default; level = "type" for the type-level meta-path rollup; supports schemas mixing types, concrete codes, and *).