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fix(agent): hand the decision model the state ai prepared (#1011)

* fix(agent): hand the decision model the state ai prepared

page.goal failed on every call through the gateway with `state.map is not a
function`. ai wraps the state as `[{ type: 'json', value }]` and the
DecisionModelV4 contract types it as an array of parts, but
withPlainDecisionState unwrapped it again. The fake models in the tests accept
either shape, so only a live call could show it.

Removes the wrapper instead of special-casing the gateway: @ai-sdk/typesafe-ai
needs the array too at every version the range allows. The wrapper's model id
lookup goes with it, since experimental_decide already resolves one the same way.

The gateway tests use the real provider over a stubbed fetch, so CI catches a
wrong shape with no key. A live test runs when AI_GATEWAY_API_KEY is set.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(agent): require the ai version the decision state fix works on

ai below 7.0.133 hands a typesafe model a plain state and it fails with
state.flatMap is not a function. 7.0.133 to 7.0.135 send a wire field the
gateway test does not read. 7.0.136 is the lowest version the suite passes on.

Also drop the passed branch of the gateway stub: yes is already the first id.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(agent): collapse the gateway stub answer into one call

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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