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- Added background agent architecture for processing tool observations and generating session summaries. - Created SDK Prompts Module for generating prompts for the Claude Agent SDK. - Developed XML Parser Module for parsing observation and summary XML blocks from SDK responses. - Implemented SDK Worker Process to handle observation processing and session management. - Updated newHook implementation to spawn the SDK worker as a detached process with path resolution for development and production. - Created comprehensive test suite for SDK prompts, XML parsing, and HooksDatabase integration, ensuring all tests pass. - Documented Phase 2 implementation details, architecture validation, and success criteria in PHASE2-COMPLETE.md.