[Band-Aid] Integrate jumpToDeepest into open.ts for Simplified Project Access

[leebrandt]

Currently, opening project markdown files requires navigating a duplicated directory structure ([project-name]/[projects]/[project-name]). This issue aims to implement a quick fix by integrating the jumpToDeepest function into the open.ts command. This will allow users to simply type grind open [project-name] and have the tool automatically resolve the correct path to the project files.

Acceptance Criteria:

• The open command correctly resolves the project path using jumpToDeepest.
• The open command opens the project markdown files as expected.
• Error handling is implemented to gracefully handle invalid project names or unresolved paths.
• Unit tests are added to verify the jumpToDeepest function's behavior in this context.

Tasks:

1. Create src/utils/pathUtils.ts and paste in the provided TypeScript code.
2. Create/modify src/utils/process.ts and paste in the provided changeDirectory function.
3. Modify src/commands/open.ts to call jumpToDeepest before opening the files.
4. Add error handling to src/commands/open.ts to catch errors from jumpToDeepest or changeDirectory.
5. Write unit tests for jumpToDeepest within src/utils/pathUtils.ts.
6. Test the open command with various project names.