feat(tools): emit full tool output for frontend display

- ls: emit full sorted file listing via tool_output (UI shows in collapsible section)
- Command: always emit stdout/stderr via tool_output (was TUI-only)

Author: JessicaMulein

cecli/tools/command.py

@@ -287,8 +287,8 @@ async def _execute_with_timeout(cls, coder, command_string, timeout, use_pty=Fal
                 # Remove from background tracking since it's done
                 BackgroundCommandManager.stop_background_command(command_key)
 
-                # Output to TUI console if TUI exists (same logic as _execute_foreground)
-                if coder.tui and coder.tui():
+                # Emit output to frontend (tool card collapsible output)
+                if output_content.strip():
                     coder.io.tool_output(output_content, type="tool-result")
 
                 if exit_code == 0:

cecli/tools/ls.py

@@ -80,6 +80,8 @@ def execute(cls, coder, path=None, **kwargs):
                     f"📋 Listed {len(contents)} file(s) in '{dir_path}'", type="tool-result"
                 )
                 sorted_contents = sorted(contents)
+                # Emit full listing for frontend tool card (collapsible output)
+                coder.io.tool_output("\n".join(sorted_contents))
                 if len(sorted_contents) > 10:
                     return (
                         f"Found {len(sorted_contents)} files: {', '.join(sorted_contents[:10])}..."