## What this models
A household member stops employment income from a chosen year, with estimated pre-Medicare (pre-65)
healthcare costs added until they turn 65.
## Maps to module(s)
- `early_retirement_v1` — set `member_id` and `member_role` ("self" or "spouse_partner"), the
`retirement_calendar_year`, the `annual_pre65_medical_usd` estimate, and `age65_calendar_year`
(the year that member turns 65, or null if already 65+ at retirement).
## Information needed
- Which member is retiring (use a member id from get_scenario_building_context).
- The retirement year.
- An estimated annual pre-65 healthcare cost (use a reasonable default like 18000 if unknown).
## Defaults & assumptions
- Compute `age65_calendar_year` from the member's birth year (birth year + 65); null if already 65+.
- Default pre-65 medical to a reasonable estimate if the user doesn't give one.
## Prerequisites
- An eligible household member with employment income.
## How to summarize to the user
"{MEMBER} retires in {YEAR}, with about {MEDICAL}/yr modeled for healthcare until age 65."
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