Resolve "fix: prevent .setup_job_path from exiting early when no path is set"

Summary

• Fix .setup_job_path template behavior to not exit prematurely when no path is set
• Add support for home paths (~ and ~/subdir)
• Improve script robustness with better error handling
• Reorganize conditional structure for clearer flow

Related Issue(s)

Link the Issue(s) and ensure auto-closing on merge.

• Closes #1 (closed)

How to Test

Step-by-step instructions so reviewers can reproduce locally or in CI.

1. Use template with empty job_path (should stay in current directory)
2. Use with job_path: "." (should stay in current directory)
3. Use with relative, absolute, and home paths
4. Verify no premature exit in any case

Expected result: …

Breaking Changes?

• No
• Yes — migration notes below

Migration notes (if any):

• …