fix(ai): forward tool strict mode in toolsToModelTools

The core AI SDK's `prepareToolsAndToolChoice` already forwards
`tool.strict` when building `LanguageModelV2FunctionTool` objects,
but `@workflow/ai`'s `toolsToModelTools` does not.

This means tools with `strict: true` lose that flag when run
through DurableAgent, causing providers that support strict
schema validation to fall back to non-strict mode.

Align with the AI SDK by conditionally spreading `strict` when
the tool defines it.

Author: iNishant

packages/ai/src/agent/tools-to-model-tools.ts

@@ -4,6 +4,8 @@ import type {
 } from '@ai-sdk/provider';
 import { asSchema, type ToolSet } from 'ai';
 
+// Mirrors the tool→LanguageModelV3FunctionTool mapping in the core AI SDK's
+// prepareToolsAndToolChoice (ai/src/prompt/prepare-tools-and-tool-choice.ts).
 export async function toolsToModelTools(
   tools: ToolSet
 ): Promise<Array<LanguageModelV3FunctionTool | LanguageModelV3ProviderTool>> {
@@ -25,6 +27,11 @@ export async function toolsToModelTools(
         name,
         description: tool.description,
         inputSchema: await asSchema(tool.inputSchema).jsonSchema,
+        ...(tool.inputExamples != null
+          ? { inputExamples: tool.inputExamples }
+          : {}),
+        providerOptions: tool.providerOptions,
+        ...(tool.strict != null ? { strict: tool.strict } : {}),
       };
     })
   );