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 READING DEPENDENCY REFERENCES: Run the question flow embedded in this SKILL.md first. Ask one consolidated dependency-selection question, then ask only conditional follow-up questions required by the selected options. Read only the dependency references selected by the user's answers. Use consultative language, present trade-offs, and wait for user responses before implementing

When to use this skill