v1.39.0

feat(ws): close agents with dd, scroll with the wheel, and fix ctrl+h/j/k/l in the dashboard

In dg ws, ctrl+h/j/k/l never reached the dashboard: tmux moved panes
instead, so you couldn't jump between the spaces and agents sections (only
ctrl+shift worked, by accident). This release fixes that, fills in the parts of
the agents-section design that were missing, and stops dg configure from
deploying an older build's configs.

• Fix the tmux pass-through for the dashboard. The check for devgeta ws sat in
  a second if-shell nested inside the Vim check, and tmux strips escapes once
  more in a nested command, so its pattern reached grep broken and never
  matched. Both checks now share one if-shell "$is_vim || $is_dgws".
• d d on an agent row closes that agent's pane only, with the same two-press
  confirm as every other d. Other panes in the window (an editor next to the
  coder) stay open; it never deletes a worktree or kills a session itself.
• The mouse wheel scrolls whatever is under the pointer: over a section it moves
  that section's cursor and stops at its ends, over the diff it scrolls three
  lines a notch.
• While filtering, the text each row matched on is highlighted in both sections.
• dg configure no longer deploys stale configs from a local build. The
  unpacked config folder was named by version and commit only, which every
  build of one commit with uncommitted changes shares, so a later build reused
  an earlier build's hooks and templates. The name now includes a fingerprint
  of the embedded configs, so any change unpacks fresh.

Behavior changes: plain ctrl+h/j/k/l now move within the dashboard and hand
off to the next tmux pane at its edges. d in the agents section now arms a
close instead of doing nothing.

Migration: after upgrading, run dg configure tmux --force to load the fixed
bindings (it reloads tmux when run inside it).

Full Changelog: v1.38.1...v1.39.0