tidyactuarial 0.1.4

• Fixed the multiple-life Monte Carlo workflow used in the mc_annuity() examples.
• simulate_lifetimes() now constructs lifetime simulations defensively when mortality inputs contain invalid terminal values.
• mc_multilife_status() now uses defaults compatible with simulate_lifetimes(): sim_id, life_id, Kx, and Tx.
• Added a regression test for the full multiple-life simulation workflow.