Add concrete run command for Safe wallet examples

[StapeltonAriana]

Show a ts-node command that runs a Safe wallet example from the repo root once .env is populated. Mention that the example triggers a simple Safe-based split flow using the configured environment.

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Note

Document how to run the Safe wallet example with ts-node and note it performs a simple Safe-based split flow; fix README code block formatting.

• Documentation:
  • Update README.md to include a concrete ts-node examples/safeWallet/split.ts command for running a Safe wallet example from the repo root after populating .env.
  • Note that the example performs a simple Safe-based split position flow using configured keys/RPC.
  • Fix code block fencing in the usage section.

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