feat: add testnet-bradbury network support

[MuncleUscles]

Summary

• Add testnet-bradbury to built-in networks
• Update docs and guides to default to Bradbury as the developer-facing testnet
• Depends on genlayer-js with testnetBradbury export (bump needed after genlayer-js release)

Test plan

• All 437 tests pass (with locally linked genlayer-js)
• Network selection includes testnet-bradbury

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6fcdf68f-dced-4de9-8f1a-014c9472fc47

📥 Commits

Reviewing files that changed from the base of the PR and between dc34374 and b5835c4.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (8)

• README.md
• docs/delegator-guide.md
• docs/validator-guide.md
• package.json
• src/lib/actions/BaseAction.ts
• tests/actions/setNetwork.test.ts
• tests/actions/staking.test.ts
• tests/smoke.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/testnet-bradbury

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