Add first support tactic

tools/validate_data.ps1

@@ -97,9 +97,10 @@ $validActions = @("log", "dialogue", "set_objective", "spawn_deployment", "spawn
 $validEffects = @("heal_hp", "heal_mp")
 $validItemKinds = @("weapon", "armor", "accessory", "consumable")
 $validBonusStats = @("hp", "mp", "atk", "def", "int", "agi")
-$validSkillKinds = @("damage", "heal")
+$validSkillKinds = @("damage", "heal", "support")
 $validSkillTargets = @("enemy", "ally", "self", "any")
 $validSkillStats = @("atk", "def", "int", "agi")
+$validSkillEffectTypes = @("stat_bonus")
 $knownFlagIds = New-Object System.Collections.Generic.HashSet[string]
 $knownFlagValueKinds = @{}
 $joinedOfficerIds = New-Object System.Collections.Generic.HashSet[string]
@@ -658,6 +659,32 @@ function Check-Skill-Definitions() {
         if (-not $validSkillStats.Contains($stat)) {
             Fail "Skill $skillId references unsupported stat: $stat"
         }
+        $effects = Get-Prop $skill "effects" @()
+        if ($kind -eq "support" -and @($effects).Count -eq 0) {
+            Fail "Support skill $skillId must define at least one effect."
+        }
+        foreach ($effect in @($effects)) {
+            if ($effect -isnot [pscustomobject]) {
+                Fail "Skill $skillId has malformed effect."
+                continue
+            }
+            $effectType = [string](Get-Prop $effect "type" "")
+            if (-not $validSkillEffectTypes.Contains($effectType)) {
+                Fail "Skill $skillId has unknown effect: $effectType"
+            }
+            if ($effectType -eq "stat_bonus") {
+                $effectStat = [string](Get-Prop $effect "stat" "")
+                if (-not $validSkillStats.Contains($effectStat)) {
+                    Fail "Skill $skillId effect references unsupported stat: $effectStat"
+                }
+                if ([int](Get-Prop $effect "amount" 0) -eq 0) {
+                    Fail "Skill $skillId stat_bonus effect must have non-zero amount."
+                }
+                if ([int](Get-Prop $effect "duration_turns" 1) -le 0) {
+                    Fail "Skill $skillId stat_bonus effect must have positive duration_turns."
+                }
+            }
+        }
     }
 }