fix(vibenet): split acronym boundaries in humanizeKey

[omerbek]

Summary

• split acronym-to-word boundaries before the existing camelCase pass in humanizeKey
• add regression tests for USDC/API/WSTETH-style keys
• keep existing fallback behavior for ordinary camelCase and separator-delimited keys

Fixes #69.

Testing

• npx vitest run app/vibenet/library/format.test.ts
• npm run typecheck
• npm run lint
• git diff --check

Note: local install reports existing npm audit findings and Node engine warnings because this machine runs Node 21.6.1 while the repo declares Node 24.x. Lint passed with existing img-element warnings outside the touched files.

[vercel]

@omerbek is attempting to deploy a commit to the Coinbase Team on Vercel.

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[cb-heimdall]

🟡 Heimdall Review Status

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