- modelPrices submodule fields use lib.types.numbers.nonnegative
instead of lib.types.float: accepts bare ints (15) as well as floats
(15.0) and rejects negative prices for free.
- Collapse the triple-sourced default: hive-c0re serve --model-prices
now defaults to "{}" so builtin_prices() is the single in-code
fallback. The nix option default still carries the full
opus/sonnet/haiku table to self-document prices for operators.
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