[docs] [Spike] Evaluate context storage approaches

[hasjack]

Research and evaluate different approaches for storing and managing agent context.

Research Areas

• Context storage options:
  • In-memory vs persistent storage
  • Vector databases for semantic search
  • Caching strategies
• Performance considerations:
  • Memory usage
  • Query performance
  • Scalability
• Context pruning strategies:
  • Relevance scoring
  • Time-based pruning
  • Priority-based retention

Deliverables

• Analysis of storage options with pros/cons
• Performance benchmarks
• Recommended approach with justification
• Implementation considerations
• Sample code/prototypes

This research will inform the context management implementation.