Sync ref ↔ wip

Bidirectional alignment between ref (stable reference) and wip (working documents).

Folder aliases: ref folder may be named ref/ or reference/. Wip folder may be named wip/ or work-in-progress/. Detect from the paths provided — both are equivalent.

⚠️ AskUserQuestion Guard

After EVERY AskUserQuestion call, check if answers are empty/blank. If empty: output "⚠️ Questions didn't display (known bug).", present options as numbered text list, WAIT for user reply.

Phase 0: Resolve Files

If called by user ($ARGUMENTS is empty or auto):

1. Glob for ref folder (ref/ or reference/) and wip folder (wip/ or work-in-progress/) in current directory
2. If neither found → abort: "⚠️ No ref/ or wip/ folder found. Use /switch to navigate to a project first."
3. List files in both folders with last-modified dates
4. Present menu:

   🔄 Sync ref ↔ wip