Add configurable life date precision

[magicsunday]

M# Sweep — Verify compliance for this milestone

Summary

• add configuration and UI support to control how many generations display detailed birth and death dates
• propagate the new setting through module routing and date processing so life spans use full dates for early generations
• add unit coverage for the adjusted date formatting logic

Testing

• composer ci:test:php:unit (pass)
• composer ci:test:php:phpstan (pass)
• composer ci:cgl (pass)
• composer ci:test:php:unit:coverage (fail: missing coverage driver)

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Codex Task