[Contradiction Scan] Cross-reference and flag inconsistencies across collections

[jordanpartridge]

Problem

No built-in contradiction detection—wiki risks hallucinating unified truth from conflicting sources (Karpathy's personal wiki strength).

Solution

Extend searchableCollections() or new ContradictionScan:

• Query related collections semantically
• Embed diffs/contradicts (e.g., 'HRV advice: collA says rest@<50ms, collB says push')
• Output: Flagged sections in wiki notes or dedicated report

AC

• Semantic similarity threshold for 'related' chunks
• Human-readable diff format
• Integrate w/ WikiCompiler output

Video inspo: https://youtu.be/dxq7WtWxi44 (cross-refs contradictions)