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- Define SegmentationStrategy Protocol interface (Plan 13-06) - Implement UnifiedSegmentationStrategy with unified approach for all video types - Update SemanticSegmentationEngine to use strategy pattern - Add comprehensive tests for strategy extensibility (STRAT-01, STRAT-02, STRAT-03) Key changes: - SegmentationStrategy Protocol defines the strategy interface - UnifiedSegmentationStrategy implements unified approach (per user decision) - SemanticSegmentationEngine now uses strategy injection pattern - Tests verify strategy protocol, unified strategy, custom strategy injection, and extensibility The architecture supports future extension (e.g., knowledge-type specific strategies) while Phase 13 uses the unified strategy approach. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>