medicalcoder 0.6.0

• Initial CRAN submission, providing a dependency-free toolkit for ICD-9/10 code lookups
  • lookup_icd_codes(),
  • get_icd_codes(),
  • icd_compact_to_full(), and
  • is_icd().
• Introduces a unified comorbidities() interface covering Charlson (Deyo, Quan 2005/2011, Glasheen), Elixhauser (original, Quan 2005, AHRQ 2017-2025), and Pediatric Complex Chronic Conditions (v2.0/2.1/3.0/3.1).
• Adds support for present-on-admission indicators, longitudinal look-back, age scoring, and PCCC sub-condition flags within comorbidities().
• Bundles curated ICD dictionaries alongside example datasets (mdcr, mdcr_longitudinal) for reproducible testing and demonstrations.
• Includes vignettes and benchmarking summaries that document usage patterns and showcase performance without non-base dependencies.