Add diagnostic validation and fallback integration

[RNViththagan]

Changes

• Add diagnostic validation guard in TaskWrite tool to prevent task completion with compilation errors
• Implement fallback integration for modified files in design and task write tools
• Add proper TypeScript types (AIChatMachineContext, ModelMessage) and AI SDK dependency

Resolves wso2/product-ballerina-integrator#2023
Related to wso2/product-ballerina-integrator#780

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