GeezerVison

The PR description flags this as a breaking change ("validate it with TypeAdapter") — sized against the repo contract, that note does not hold: AGENTS.md states the 2.x public API is a compatibility contract and observable-behaviour changes "should generally be avoided" even when softened by @ deprecated shims; there is no shim here. FuncMetadata is documented user-facing API (docs/servers/structured-output.md, updated in this PR, tells users to inspect output_model). On base, _create_dict_model (removed at old lines 625-638) returned a RootModel subclass named {func}DictOutput; func_metadata()'s docstring still promises "a synthesized model for ... dict[str, T] ... returns" (line 317-318). After merge, _create_output_model line 511 stores Annotated[dict[str, T], Field(title=...)], and the field annotation widened from type[Any] | None to Annotated[Any, ...] (line 123), so pyright no longer flags misuse either. Any 2.x consumer that introspects tool metadata (test harnesses, custom validation layers, tool registries re-deriving schemas) and calls a classmethod on…

Verification: normal — acknowledged in diff: the PR description's "Breaking Changes" section states "FuncMetadata.output_model for dictionary returns now holds a type annotation instead of a model class; validate it with TypeAdapter", so this is a declared trade-off put up for sign-off, not an oversight; conflicts with stated purpose: restoring a BaseModel class for root-level dict serialization would…