[Issue] Modify createClassDefinition to include application mode

[m2-assistant]

This issue is automatically created based on existing pull request: #40567: Modify createClassDefinition to include application mode

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Disable runtime code generation in production mode

Description

This patch stops Magento from generating Interceptors, Factories, and Proxies at runtime when running in production mode.

In production, all generated classes must be created beforehand by bin/magento setup:di:compile. If they are missing (for example after generated/code is cleared during deployment), Magento should fail with a clear error instead of generating them on the fly.

Changes

• DefinitionFactory: Registers the Generator Autoloader only when the application mode is not production.
• ObjectManagerFactory: Passes the application mode from deployment config into createClassDefinition().

Behaviour

Mode	Generator Autoloader	Runtime generation
developer	Registered	Yes
default	Registered	Yes
production	Not registered	No

Requirements

• Run bin/magento setup:di:compile during deployment before serving traffic.
• Ensure generated/code is populated before going live.

[m2-assistant]

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[engcom-Bravo]

Marking this as Feature Request