Fix player damage system: migrate to 3-layer defense and fix projectile owner ID

[Copilot]

Player was not taking damage from enemy projectiles due to owner ID mismatch. Enemy projectiles created with owner: "enemy" (string) caused CollisionSystem entity lookup to fail, filtering out all enemy projectiles.

Critical Fixes

Enemy projectile owner ID (js/systems/CombatSystem.js)

• Changed owner: "enemy" → owner: enemy.id (numeric entity ID)
• CollisionSystem can now resolve owner entity for damage routing

Player defense system migration (js/Game.js, js/systems/CollisionSystem.js)

• Replaced legacy health component with defense component (shield/armor/structure layers)
• Fixed invulnerability tracking: now on defense.invulnerable instead of health.invulnerable
• Updated damage flow: projectile collision → DefenseSystem.applyDamage() → shield → armor → structure

XP bar field mismatch (js/Game.js, js/systems/UISystem.js)

• Changed xpToNext: 100 → xpRequired: 100 to match all system expectations
• Fixed calculation: (xp / undefined) * 100 → (xp / xpRequired) * 100

UI Cleanup

• Removed duplicate legacy stats panels and health bars from index.html, js/systems/UISystem.js, js/ui/EnhancedUIComponents.js
• Single defense UI system remains: 3-layer bars (shield/armor/structure)

Architecture

DefenseSystem integration:

// CombatSystem creates projectiles with valid owner
projectile.owner = enemy.id;  // numeric entity ID

// CollisionSystem routes damage
const ownerEntity = this.world.getEntity(projComp.owner);  // now resolves
if (ownerEntity?.type === 'enemy') {
    const damagePacket = DamagePacket.simple(damage, damageType);
    this.world.defenseSystem.applyDamage(player, damagePacket);
}

DamagePacket enforcement:

• All damage calls now use DamagePacket structure
• Added validation for legacy numeric calls with warnings

Debug Support

Added comprehensive debug logging gated by window.DEBUG_DEFENSE:

• Damage application with layer details
• Regeneration ticks
• Collision detection flow
• Owner entity resolution

Documentation

Moved all markdown reports to /rapports folder with detailed diagnostics.

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