readmit 1.0.0

• readmit retains its hospital-readmissions focus and evolves from the
  exploratory utilities in 0.0.1 into the Readmission Risk Pool (RRP), a
  project-based framework for repeated readmission risk assessment. This
  revision intentionally changes the public API and moves from MIT to Apache
  License 2.0.
• rrp_project_init() creates a user-owned project with editable configuration,
  source-mapping and risk-provider scripts, branding, and a Shiny application.
  Project authors supply their own clinical data mapping and risk logic;
  rrp_project_validate() checks the authoring structure, and
  rrp_state_init() establishes persistent history.
• rrp_run() assesses the remaining risk of a first readmission through 30
  elapsed days after discharge at a chosen analytical time. It applies shared
  eligibility rules to project-supplied canonical data and retains accepted
  estimates, provider failures, and ineligible outcomes. Use
  rrp_project_status() and rrp_inspect_history() to examine the results.
• rrp_refresh_products() derives current remaining risk, recorded risk
  trajectories, and an operational scope summary as CSV files from retained
  history. The project-owned Shiny app opens with empty views before products
  exist and displays them after refresh.
• A short installed getting-started vignette and a reproducible website
  implementation guide demonstrate the project workflow with illustrative
  data and risk logic. No clinically validated prediction model is included.