111-java-maven-dependencies

# Add Maven dependencies for improved code quality Add essential Maven dependencies that enhance code quality and safety through a consultative, question-driven approach. **This is an interactive SKILL**. **What is covered in this Skill?** - JSpecify: (nullness annotations, `provided` scope) - Error Prone + NullAway: (enhanced static analysis with compile-time null checking) - VAVR: (functional programming with Try/Either and immutable collections) - ArchUnit: (architecture rule enforcement, `test` scope) ## Constraints Before adding Maven dependencies, ensure the project is in a valid state. Use a consultative, question-driven flow that adds only what the user selects. - **MANDATORY**: Run `./mvnw validate` or `mvn validate` before any changes - **SAFETY**: If validation fails, stop and ask the user to fix issues—do not proceed until resolved - **BEFORE ASKING QUESTIONS**: Read the reference to use the exact wording and options from the template. Ask questions one-by-one in strict order (JSpecify → Enhanced Compiler Analysis (conditional) → VAVR → ArchUnit) and add only what the user selects. Use consultative language, present trade-offs, and wait for user responses before implementing ## When to use this skill - Add Maven dependencies - Add JSpecify nullness dependencies - Add Error Prone NullAway dependencies - Add VAVR functional dependencies - Add ArchUnit architecture testing dependencies ## Workflow 1. **Validate project before changes** Run `./mvnw validate...