feat: add signed deadline rule and EIP-712 injector

[Mkalbani]

Summary

Implements both requested BridgeWise issues:

• [RULE] Rule B009: Enforce Expiration Deadlines in Cross-Chain Signed Messages #847: Adds Rule B009 to detect cross-chain signed payloads without expiration deadlines and block.timestamp <= deadline validation.
• [CORE] Rule B010: Automated AST EIP-712 Domain Separator Injector #851: Adds an EIP-712 domain separator injection transformer for signature verification functions.

Changes

• Added B009 AST rule implementation.
• Added B009 Solidity fixtures covering valid and invalid deadline checks.
• Registered B009 with the rules module.
• Added bridgewise-cli EIP-712 transformer crate.
• Added AST-based function detection and source transformation.
• Added EIP-712 transformation fixtures and tests.

Validation

• TypeScript CLI build passes.
• git diff --check passes.
• Rust tests could not be executed because cargo and rustc are unavailable in the container.

Closes #847
Closes #851

[mijinummi]

LGTM!