sl0p: propose per-pane workspace hints

A design doc, not an implementation: lets a project ship a layout that also tells
an agent what each pane is for.

The load-bearing decision is the boundary -- zellij carries one opaque string per
pane and never interprets it, pi owns the whole vocabulary. That keeps the fork
change to a single field threaded along the existing status_bar path, and lets the
vocabulary change without rebuilding zellij.

Records two findings that were checked rather than assumed, since both would
otherwise be discovered the expensive way: pane names cannot carry metadata (there
is no stable name field at runtime, and title is clobbered by whatever the program
sets), and the runtime query surface already exists (list-panes --json), so the
work is only to get the field into it.

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