pointcoral 0.1.0

Initial CRAN submission candidate

• Added CPCe .cpc import, image matching, label crosswalk support, ecological summaries, ML point CSV export, point patch extraction, sparse mask creation, QC overlays, and high-level workflow wrappers.
• Added sample CPCe/image fixtures and an example editable crosswalk.
• Added read_cpce_output_raw_tabs() for extracting CPCe output workbook sheets ending in _raw, adding image names from sheet names, preserving CPCe point order with point_index, preserving CPCe group codes, and adding full major_category values.