feat(planner): add execution context to prompts

runtime/planner_prompts.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import json
+from datetime import datetime
 from typing import Any
 
 PLANNER_SYSTEM_PROMPT = """You are the planning brain of a mobile device automation agent.
@@ -66,8 +67,18 @@ def planner_user_prompt(
     goal: str,
     scene_json: dict[str, Any],
     history_summary: list[dict[str, Any]],
+    device_platform: str | None = None,
+    now: datetime | None = None,
 ) -> str:
+    current_time = now or datetime.now().astimezone()
+    if current_time.tzinfo is None:
+        current_time = current_time.astimezone()
+    timezone_name = current_time.tzname() or str(current_time.tzinfo) or "unknown"
     return (
+        "Execution context:\n"
+        f"Current date and time: {current_time.isoformat(timespec='seconds')}\n"
+        f"Time zone: {timezone_name}\n"
+        f"Device type: {_device_type(scene_json, device_platform)}\n\n"
         "Goal:\n"
         f"{goal}\n\n"
         "Current Scene (JSON):\n"
@@ -76,3 +87,16 @@ def planner_user_prompt(
         f"{json.dumps(history_summary, ensure_ascii=False, sort_keys=True)}\n\n"
         "Call exactly one tool for this turn."
     )
+
+
+def _device_type(scene_json: dict[str, Any], device_platform: str | None) -> str:
+    platform = device_platform
+    if platform is None:
+        app = scene_json.get("app")
+        if isinstance(app, dict):
+            raw_platform = app.get("platform")
+            platform = raw_platform if isinstance(raw_platform, str) else None
+    if not isinstance(platform, str):
+        return "unknown"
+    normalized = platform.strip().lower()
+    return normalized if normalized in {"ios", "android"} else "unknown"