Add check for P2SH output after genesis activation

[ctnguyen]

No description provided.

[github-actions]

🤖 Claude Code Review

Status: Complete

---

Current Review:

This PR implements P2SH output rejection after Genesis activation (issue #4333). The implementation looks correct:

✅ Core logic is sound: The P2SH check is properly gated by policy checks and Genesis activation
✅ Consistency fixed: Uses shared isGenesisActivated variable with > comparison (excluding Genesis block itself)
✅ Test coverage: Comprehensive test cases verify behavior at Genesis height, after Genesis, and with policy skip option
✅ Documentation: Comments explain the > vs >= distinction for Genesis block handling

Minor observations:

• Test uses hardcoded transaction hex string - this is acceptable for a known P2SH transaction
• Error message format matches existing patterns in the codebase

History:

• ✅ Fixed: Previously used >= comparison which would incorrectly reject P2SH in Genesis block 620538. Now correctly uses > comparison consistent with dust limit check.

No blocking issues found.