De-Springify Core and Agentic Memory modules

[kornelrabczak]

Summary

Refactor the core and agentic-memory modules to remove Spring Framework dependencies, making them pure Java libraries. This allows users to integrate these modules without being forced to adopt Spring.

Motivation

Currently, both core and agentic-memory modules have deep Spring dependencies:

• core: Spring AI, Spring Data (ladybugdb), Spring Transaction, Spring Context
• agentic-memory: Spring Context for DI and configuration properties

This creates a barrier for projects that:

• Use alternative DI frameworks (Guice, Dagger, Jakarta CDI)
• Prefer lightweight, framework-agnostic libraries
• Have strict dependency constraints

Non-Goals

• De-springifying mcp and agentic-memory-mcp modules (these are Spring Boot applications by design)
• Removing Spring from load-tests module

Success Criteria

• core module has zero Spring dependencies in pom.xml
• agentic-memory module has zero Spring dependencies in pom.xml
• Both modules can be used in plain Java projects
• All existing tests pass
• Spring integration available via separate module