Agentic Vault Search and Organization in Harvey

Introduces 'Agentic Vault Search' and 'Agentic Vault Organization' to enhance document discovery and structuring within Harvey's Vault system. Agentic Vault Search allows AI agents to locate relevant documents across entire Vaults without explicit folder or naming instructions, leveraging signals like folder location, naming conventions, and uploader identity. Agentic Vault Organization enables users to instruct agents in natural language to rename and reorganize files (e.g., by counterparty and agreement type), with a proposed plan and human confirmation step before execution. These features operate within existing permission and audit trail frameworks, and do not edit document content.