Command-Based Entity Movement in Combat

[FirebrickRed]

Summary

Add /combat move <entity> <direction> <blocks> command for DMs to move entities during combat without possession.

Context

Issue #98 added movement tracking for:

• Players on their own turn
• DM-possessed entities (tracked via NpcListener possession system)

This ticket covers an additional movement method: direct command-based movement for entities.

Proposed Commands

• /combat move <entity> north 3 - Move entity 3 blocks north
• /combat move <entity> forward 5 - Move relative to entity facing
• Or: click-to-move system where DM selects destination

Acceptance Criteria

• DM can move entities via command during entity's turn
• Movement tracked against entity's speed budget
• Action bar shown to DM during entity's turn
• Movement undo works for command-moved entities

Notes

• Lower priority than possession-based movement (already implemented in Turn Management & Action Economy #98)
• Consider whether this overlaps with or replaces the possession system for some use cases