gp3sequences 0.1.0

• Initial public release.
• Created the independent gp3sequences package scaffold.
• Added MIT licensing and package-level documentation.
• Added the initial testthat edition 3 infrastructure.
• Defined the initial neutral scope and interpretation boundary.
• Added the initial README and pkgdown website configuration.
• Added a multi-platform GitHub Actions R CMD check workflow for macOS, Windows, Ubuntu release, and Ubuntu devel.
• Added a GitHub Actions pkgdown workflow for automated website building and deployment.
• Added audit_sequence_data() and validate_sequence_data() for structured input diagnostics.
• Added prepare_sequence_data() with explicit missing-state, duplicate-position, repeated-state, duration, and unknown-state policies.
• Added encode_sequence_data() for deterministic state dictionaries and transparent state codes.
• Added summarise_sequence_states(), summarise_sequence_transitions(), and format_sequence_paths() for structural sequence summaries.
• Added extract_sequence_ngrams() for deterministic contiguous motif enumeration with explicit overlap handling.
• Added summarise_sequence_motifs(), filter_sequence_motifs(), and format_sequence_motifs() for transparent motif prevalence, filtering, and reporting.
• Added summarise_sequence_motif_positions() and format_sequence_motif_positions() for deterministic structural location summaries.
• Added dependency-free plot_sequence_motifs() and plot_sequence_motif_positions() visualisations plus a synthetic contiguous-motif workflow article.