docs(todo): record TRAMP/dirvish "?" root cause, leave fix to verify

I traced why remote dirvish shows "?" for dates: dirvish fetches remote attributes through an async `ls -1lahi` parser that only runs when the connection has direct-async and the remote has GNU ls. It falls back to skipping `file-attributes` (rendering "?") when either gate is shut. That's why the earlier dired-listing-switches attempts missed the real path, and why disabling direct-async made it worse.

The config already enables direct-async, so the rest is per-host and needs a live remote. I left the three diagnostic evals and the likely fixes in the task body.

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