Add vector service module and integration tests

[tanakachitsamba]

Summary

• add a reusable vector_service module with CLI commands for ingest, query, and delete
• refactor the legacy ingestion script to rely on the shared vector service configuration helpers
• document configuration and usage flows and add an integration test that exercises ingest, query, and delete

Testing

• pytest (fails: ModuleNotFoundError: No module named 'chromadb')

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https://chatgpt.com/codex/tasks/task_e_68e42c0ffe24832886709fed1b3fa11c

[Copilot]

Pull Request Overview

This PR introduces a comprehensive vector service module that centralizes Chroma vector database interactions with improved architecture and testing. The changes refactor the existing ingestion script to use shared configuration helpers while maintaining backward compatibility.

• Adds a new vector_service.py module with CLI commands for ingest, query, and delete operations
• Refactors the legacy add_documents.py script to delegate to the new vector service infrastructure
• Updates documentation with comprehensive usage examples and configuration details

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
vector_service.py	Core module implementing vector database operations with CLI interface and configurable embedding backends
tests/test_vector_service_integration.py	Integration test exercising ingest, query, and delete functionality end-to-end
add_documents.py	Refactored legacy script maintaining backward compatibility while using new vector service infrastructure
README.md	Updated documentation with installation instructions, configuration options, and usage examples

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