Implement executing tasks

core/presence/inference.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import time
+
+
+def now_ms() -> int:
+    return int(time.time() * 1000)
+
+
+def fade_confidence(elapsed_ms: int, fade_threshold_seconds: int) -> float:
+    """
+    Convert elapsed inactivity to a confidence score for fading state.
+
+    Confidence starts at 0.7 when fading begins and decays toward 0.2 over
+    4x fade threshold windows.
+    """
+    threshold_ms = max(1, int(fade_threshold_seconds or 900) * 1000)
+    if elapsed_ms <= threshold_ms:
+        return 0.7
+    over = min(4.0, float(elapsed_ms - threshold_ms) / float(threshold_ms))
+    return max(0.2, 0.7 - (over * 0.125))
+
+
+def should_fade(last_event_ts: int, now_ts: int, fade_threshold_seconds: int) -> bool:
+    if last_event_ts <= 0:
+        return False
+    threshold_ms = max(1, int(fade_threshold_seconds or 900) * 1000)
+    return int(now_ts) - int(last_event_ts) >= threshold_ms