ggchangepoint 0.2.0

Major changes

• New ggcpt S3 result class with tidy(), glance(), augment(), and autoplot() methods
• New cpt_detect() unified dispatcher for all changepoint methods
• New geoms: geom_changepoint(), geom_cpt_segment(), geom_cpt_ci(), stat_changepoint()
• New first-wave wrappers: WBS/WBS2, NOT, MOSUM, FPOP, Isolate-Detect, TGUH
• New ggcpt_compare() and ggcpt_compare_table() for method comparison
• New evaluation module: cpt_metrics(), cpt_metrics_annotated(), ggcpt_eval()
• New simulator: cpt_simulate()/rcpt() and canonical test signals
• New cpt_penalty() helper

Hardening (bug fixes)

• ecp_wrapper() no-change bug fixed: spurious boundary changepoints and NA no longer emitted
• size → linewidth migration: cptline_linewidth replaces deprecated cptline_size
• match.arg() input validation added to all wrappers
• Changepoint convention documented and aligned
• “sytle” typo fixed → “style” in documentation
• roxygen modernised to "_PACKAGE" sentinel
• change_in = "np" alias added (keeps "cpt_np" for backward compatibility)
• Full-height changepoint rule default; show_points auto-off above 500 obs
• Optional index parameter for time-series axes

Testing

• New testthat test suite with coverage for all new and hardened functions
• vdiffr snapshot tests (where available)

ggchangepoint 0.1.0

• Initial release to CRAN.