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

agent/display.py

@@ -31,6 +31,8 @@ def build_tool_preview(tool_name: str, args: dict, max_len: int = 40) -> str:
         "vision_analyze": "question", "mixture_of_agents": "user_prompt",
         "skill_view": "name", "skills_list": "category",
         "schedule_cronjob": "name",
+        "execute_code": "code", "delegate_task": "goal",
+        "clarify": "question", "skill_manage": "name",
     }
 
     if tool_name == "process":
@@ -97,7 +99,7 @@ def build_tool_preview(tool_name: str, args: dict, max_len: int = 40) -> str:
 
     key = primary_args.get(tool_name)
     if not key:
-        for fallback_key in ("query", "text", "command", "path", "name", "prompt"):
+        for fallback_key in ("query", "text", "command", "path", "name", "prompt", "code", "goal"):
             if fallback_key in args:
                 key = fallback_key
                 break