v0.4.0 - 1:1 Karpathy Parity

All gaps from the Karpathy Wiki pattern are now closed.

New features:

• Query Filing: wiki_query files 2+ matches as .codebase-wiki/queries/ pages
• Evolution Persistence: wiki_evolve writes to .codebase-wiki/evolution/
• Changelog Persistence: wiki_changelog writes to .codebase-wiki/CHANGELOG.md
• Concept Pages: wiki_concept creates cross-cutting pattern pages
• Contradiction Detection: wiki_lint flags high-overlap pages as potential duplicates
• Agent Notification: lint sends contradictions to agent via pi.sendUserMessage

Bug fixes:

• addCrossReference() signature (3 separate args)
• Missing WikiPage fields in upsertPage calls
• Concept tool template string compilation