Add chain reorganization detection and chain.reorg.detected event #31
Description
Summary
Detect Ethereum chain reorganizations that invalidate previously confirmed transactions. Emit chain.reorg.detected event and re-verify affected transactions.
Changes
- Monitor for uncle/orphan blocks by tracking parent hash continuity
- On reorg: identify affected transactions, reset finality to pending
- Emit chain.reorg.detected with old/new block info and affected tx hashes
- Re-verify transactions from new canonical chain head
Tests
- Simulated reorg triggers detection
- Affected transaction is reset to pending
- chain.reorg.detected event contains correct metadata
Acceptance Criteria
Reorgs are detected and affected transactions are re-verified automatically.