Resolves merge conflicts with main (feat/person-notes merged first).
Combines both features: birth/death years and notes field on person detail.
Renames migration V5__add_birth_death_years to V6 to avoid Flyway conflict.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
V5 Flyway migration adds birth_year and death_year INTEGER columns.
Service validates birthYear <= deathYear (400 otherwise). Frontend edit
form adds year number inputs; view mode renders * year / † year. Backed
by 3 backend service tests and 1 E2E test.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>