Add poison damage over time tactics

README.md

@@ -14,7 +14,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 - Damage forecast for selected-unit attacks.
 - Terrain defense and avoid affect physical attack damage and hit chance.
 - Min/max attack ranges and counterattack forecasts.
-- MP tactics with low/high damage options, healing options, ally support buffs, enemy debuffs, a skill list menu, previews, and target overlays.
+- MP tactics with low/high damage options, healing options, ally support buffs, enemy debuffs, poison damage-over-time, a skill list menu, previews, and target overlays.
 - Campaign inventory consumables with an item menu, HP/MP recovery preview, and target overlay.
 - Weapon, armor, and accessory rewards can be stored, displayed, and equipped from the battle HUD.
 - Scenario-specific pre-battle shop purchases, optional finite shop stock, and 50% sell-back save immediately and sync into the upcoming battle inventory.
@@ -111,7 +111,7 @@ Godot 4 tactical RPG prototype inspired by classic turn-based Romance of the Thr
 - Dialogue portrait slot with officer default image paths, optional per-line overrides, and speaker-initial fallback.
 - Dialogue lines can place the portrait on the left or right side of the dialogue panel.
 - Placeholder menu/battle BGM plus UI, movement, attack, tactic, item, victory, and defeat SFX.
-- Floating combat text for damage, recovery, misses, support effects, level-ups, and promotions.
+- Floating combat text for damage, recovery, misses, support effects, poison ticks, level-ups, and promotions.
 - Short unit slide animation for board movement.
 - Hover target preview badges for attacks, tactics, and items.
 - Low-HP board unit warning rings and HP bar color states.