Improve git worktree session workflow

hooks/session-create.sh

@@ -2,8 +2,14 @@
 
 session_name=$(tmux display-message -p '#S')
 session_layout=~/.local/share/tmux/layouts/session-$session_name
+# Set by `session -p <project>`, which names the session after the project but
+# can't be relied on for the lookup above since tmux rewrites `.` in names.
+session_project=$(tmux show-environment -t "$session_name" TMUX_PROJECT 2>/dev/null |
+  sed -n 's/^TMUX_PROJECT=//p')
 if [ -f $session_layout ]; then
   $session_layout
+elif [ -n "$session_project" ]; then
+  ~/.local/share/tmux/layouts/session-project "$session_project"
 elif [ "$session_name" != "agent" ]; then
   tmux rename-window home
 fi