fix(skills): drop the homeAmount paragraph the main merge doubled; the file is main's again

Claude-Session: https://claude.ai/code/session_01Utp6CYUAEJV7QpzuJm62Te
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

skills/objectstack-data/rules/field-types.md

@@ -181,11 +181,6 @@ home-currency amount in `field` (a `'dynamic'` `currency`) at the `rateDate`
 (`date`) rate, and that rate in `rateField` (`number`), both `readonly: true`.
 Cross-currency totals sum `field`.
 
-`homeAmount` (`'record'` only, all three required): the engine stores the
-home-currency amount in `field` (a `'dynamic'` `currency`) at the `rateDate`
-(`date`) rate, and that rate in `rateField` (`number`), both `readonly: true`.
-Cross-currency totals sum `field`.
-
 ### Select with Default
 
 ```typescript