Adds preview_changes method to utils/neo4j-schema-init.py. Performs
read-only queries against the live database to compare current state
against the v2.3.0 schema spec. Reports expected constraints, indexes,
and sample nodes/relationships by team.
- Introduced `neo4j-schema-init.py` for creating the foundational schema for the personal knowledge graph used by multiple AI assistants.
- Implemented functionality for creating constraints, indexes, and sample nodes, along with comprehensive testing of the schema.
- Added `neo4j-validate.py` to perform validation checks on the Neo4j knowledge graph, including constraints, indexes, sample nodes, relationships, and junk data detection.
- Enhanced logging for better traceability and debugging during schema initialization and validation processes.
