feat: add testnet-bradbury chain configuration

[MuncleUscles]

Summary

• Add Bradbury testnet as a new chain configuration with v0.6 ConsensusMain and ConsensusData ABIs
• Reuses existing Staking ABI (Diamond proxy interface is compatible)
• Update docs to reference Bradbury as the developer-facing testnet

Bradbury addresses

• ConsensusMain: 0x0112Bf6e83497965A5fdD6Dad1E447a6E004271D
• ConsensusData: 0x85D7bf947A512Fc640C75327A780c90847267697
• Staking: 0x4A4449E617F8D10FDeD0b461CadEf83939E821A5

Test plan

• npm run build passes
• All 27 unit tests pass
• Chain exports correctly from genlayer-js/chains

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 44b040bb-e5a5-49bf-8e85-4c83b881ae33

📥 Commits

Reviewing files that changed from the base of the PR and between a6a5c87 and c122659.

📒 Files selected for processing (7)

• CLAUDE.md
• README.md
• src/chains/index.ts
• src/chains/testnetBradbury.ts
• src/types/network.ts
• src/wallet/connect.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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