Add project path resolver

[timothyF95]

Fix: Resolve file path flags relative to project root for workflow subcommands

Summary

Added ProjectRootDir to the runtime context to store the project root directory after initial context change. Created a generic ResolvePathRelativeTo() utility that workflow subcommands use to resolve file path flags (like --http-payload) relative to the project root instead of the workflow directory, ensuring paths work correctly regardless of where the workflow executes.