Docs samples for Python SDK 4.0

New features

• The Python samples on the SDK, Deploy your first Fusion vault, Fusion for agents, Common errors and Addresses pages use the ipor-fusion 4.0 API. They do not run on 3.x.
• The SDK page covers the address registry, calldata decoding, preflight_execute before signing, AccessManager timelocks with read_call_plan and market limits as Wad fractions. The CLI examples add fusion vault preflight, fusion vault validate and fusion address.
• The factory table on the Addresses page follows the SDK 4.0 deploy guide. It lists Flare, Monad, HyperEVM and Robinhood and has a column showing on which chains the SDK vault tooling runs.
• The revert table on Common errors adds HandlerNotFound() and shows how to check a missing role with AccessManager.can_call.
• A new file, /docs/llms-fusion.txt, holds the full text of the nine docs pages a vault builder needs, in the order of the deploy path. It is 62 KB, against 684 KB for /docs/llms-full.txt, for AI agents that load a single file.
• The SDK and Fusion for agents pages state that the cross-chain and HyperCore contracts are production. Their SDK API is still in preview and may change between minor versions.