feat: show detailed tool call args in gateway based on config

Issue #263: Telegram/Discord/WhatsApp/Slack now show tool call details
based on display.tool_progress in config.yaml.

Changes:
- gateway/run.py: 'verbose' mode shows full args (keys + JSON, 200 char
  max). 'all' mode preview increased from 40 to 80 chars. Added missing
  tool emojis (execute_code, delegate_task, clarify, skill_manage,
  search_files).
- agent/display.py: Added execute_code, delegate_task, clarify,
  skill_manage to primary_args. Added 'code' and 'goal' to fallback keys.
- run_agent.py: Pass function_args dict to tool_progress_callback so
  gateway can format based on its own verbosity config.

Config usage:
  display:
    tool_progress: verbose  # off | new | all | verbose

run_agent.py

@@ -2442,7 +2442,7 @@ class AIAgent:
             if self.tool_progress_callback:
                 try:
                     preview = _build_tool_preview(function_name, function_args)
-                    self.tool_progress_callback(function_name, preview)
+                    self.tool_progress_callback(function_name, preview, function_args)
                 except Exception as cb_err:
                     logging.debug(f"Tool progress callback error: {cb_err}")