feat: contract verification wallet network guard

[Oluwaseyi89]

Implement contract-aware verification metadata and wallet network mismatch guard

Overview

This PR adds end-to-end contract-aware verification metadata to ensure AI results anchor to on-chain events, and implements a wallet network mismatch guard for mobile.

Changes

Contract-Aware Verification Metadata (#468)

• Include stable identifiers (campaign reference, claim ID, package ID) in verification result payloads
• Validate identifiers and reject malformed inputs early with proper error handling
• Add tests validating payload shape and metadata propagation

Wallet Network Mismatch Guard (#448)

• Detect wallet network mismatch and block on-chain actions when not on Testnet
• Provide clear remediation guidance when mismatch is detected
• Add tests covering mismatch detection and recovery flows

Files Added

• Tests for payload validation and metadata propagation
• Tests for wallet network mismatch detection and recovery

Files Modified

• AI verification result payload structure
• Wallet connection and signature request flow

Closes #468
Closes #448

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