@devtools/core v0.0.5

Summary

• Add typed React Fiber, FiberRoot, and renderer interfaces for React 18/19 internals.
• Add stable WorkTag constants and labels for walker-visible component types.
• Add runtime guards that return typed diagnostics for unsupported versions, missing fields, and unknown tags.
• Export the Fiber model through @devtools/core and @devtools/core/fiber.

Verification

• npm run build --workspace=@devtools/core
• npm run format:check
• npm run lint
• npm run test:unit
• npm run build
• npm run typecheck