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a69547a7f5
Clients like the Codex app emit parameters:{type:null,...} for some tools;
OpenAI-compatible upstreams reject with '400 Invalid schema for function ...:
schema must be a JSON Schema of type object, got type null'. toolSchemaSanitizer
already dropped the null; it now re-adds the mandatory root object type (plus
empty properties / open additionalProperties when absent). Combinator roots
(anyOf/oneOf/allOf) and explicit root types are preserved.
Regression guard: 5 new cases in tests/unit/tool-schema-sanitizer.test.mjs.