3.2 - Implement LinkGraph Engine

Task ID: 3.2
Phase: 3
Description: Implement support/challenge links, contextual influence, normalized VS weighting, anti-cycle detection.
Deliverables:
- Solidity LinkGraph
- Influence integration
- DAG enforcement
- Unit tests
Dependencies: 3.1
Estimated Hours: 240
Start Hour: 961
End Hour: 1200
Bounty (VSP): 10400000