OpenAI rejects schemas where optional properties are absent from the
required array. Promote all properties to required and mark formerly
optional ones nullable so the model knows it may pass null.
Also upgrade tool error log level from Warn to Error.
Signed-off-by: Bryan Frimin <bryan@probo.com>
jsonSchemaFor panicked on unsupported types, which meant
FunctionTool, NewOutputType, and RunTyped would crash the
process during setup rather than returning a normal error.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
