fix(ws): wait for shell ready before sending commands after respawn-pane

The fixed 0.5s sleep after tmux respawn-pane was not enough time for
zsh to fully initialize (especially with plugins/themes). This caused
send-keys to fire while the shell was still loading, eating the first
character(s) of the command (e.g. "clear" became "lear").

Replace with a poll loop that waits for the shell process to appear in
the pane, then adds a small buffer before sending keys.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: MrFlounder

src/crabcode

@@ -1511,7 +1511,13 @@ EOF
         [ -n "$dev_cmd" ] && tmux send-keys -t "$SESSION_NAME:$window_name.$p_server" "$dev_cmd" C-m
 
         tmux respawn-pane -k -t "$SESSION_NAME:$window_name.$p_main" -c "$dir"
-        sleep 0.5
+        # Wait for shell to be ready (zsh/bash init can take >0.5s with plugins)
+        for _i in $(seq 1 20); do
+          local pcmd=$(tmux display-message -t "$SESSION_NAME:$window_name.$p_main" -p '#{pane_current_command}' 2>/dev/null)
+          [[ "$pcmd" =~ ^(bash|zsh|sh|fish)$ ]] && break
+          sleep 0.2
+        done
+        sleep 0.3
         [ -n "$claude_cmd" ] && tmux send-keys -t "$SESSION_NAME:$window_name.$p_main" "clear && $claude_cmd" C-m
 
         success "Workspace $num started with ticket prompt"
@@ -1963,7 +1969,13 @@ continue_workspace() {
     [ -n "$dev_cmd" ] && tmux send-keys -t "$SESSION_NAME:$window_name.$p_server" "$dev_cmd" C-m
 
     tmux respawn-pane -k -t "$SESSION_NAME:$window_name.$p_main" -c "$dir"
-    sleep 0.5
+    # Wait for shell to be ready (zsh/bash init can take >0.5s with plugins)
+    for _i in $(seq 1 20); do
+      local pcmd=$(tmux display-message -t "$SESSION_NAME:$window_name.$p_main" -p '#{pane_current_command}' 2>/dev/null)
+      [[ "$pcmd" =~ ^(bash|zsh|sh|fish)$ ]] && break
+      sleep 0.2
+    done
+    sleep 0.3
     [ -n "$claude_cmd" ] && tmux send-keys -t "$SESSION_NAME:$window_name.$p_main" "clear && $claude_cmd" C-m
 
     success "Workspace $num continued with previous session"