Fix inconsistencies: remove mechanics that don't make sense (player can't take damage)

- Remove lifesteal, thorns, manaShield from familiars
- Replace with appropriate alternatives: manaSiphon, guardianDamage, barrierBreaker
- Replace shield equipment with focus items (spellcasting enhancement)
- Remove EXECUTIONER special effect and finisher upgrades
- Update Soul Binding description to bind creature souls to items
- Buff Ancient Echo from +1 to +2 capacity per Enchanter level
- All changes consistent with game design: player cannot take damage

worklog.md

@@ -853,3 +853,58 @@ Stage Summary:
 - All tests updated and passing (65/65)
 - New achievements for progression milestones
 - All lint checks pass
+
+---
+Task ID: 22
+Agent: Main
+Task: Fix inconsistencies - remove mechanics that don't make sense (player can't take damage)
+
+Work Log:
+- **Removed lifesteal abilities from familiars**:
+  - Replaced with manaSiphon (restores mana based on damage dealt)
+  - Updated waterDroplet, phoenixHatchling, primordialPhoenix, celestialGuardian
+
+- **Removed thorns abilities from familiars**:
+  - Replaced with guardianDamage (+% damage to guardians)
+  - Updated earthPebble, crystalGolem, shieldGuardian, ancientGolem, celestialGuardian
+
+- **Removed manaShield abilities from familiars**:
+  - Replaced with barrierBreaker (+% damage to barriers) and maxManaBonus
+  - Updated crystalGolem, shieldGuardian, voidWalker, ancientGolem, leviathanSpawn, celestialGuardian
+
+- **Added new familiar ability types to types.ts**:
+  - critDamage, guardianDamage, manaSiphon, barrierBreaker, maxManaBonus, studySpeed
+  - Removed: lifeSteal, thorns, manaShield (player can't take damage)
+
+- **Replaced shield equipment with focus items**:
+  - Removed basicShield, reinforcedShield, runicShield, manaShield
+  - Added crystalOrb, manaTome, elementalFocus, soulCrystal, arcanumOrb
+  - Focus items enhance spellcasting instead of providing defense
+  - Updated EquipmentCategory from 'shield' to 'focus'
+
+- **Updated crafting recipes**:
+  - Replaced shieldBlueprint with focusBlueprint
+  - Now crafts Elemental Focus instead of Runic Shield
+
+- **Updated enchantment-effects.ts**:
+  - Changed BODY_AND_SHIELD to BODY_ONLY
+  - Changed CASTER_CATALYST_ACCESSORY to CASTER_CATALYST_FOCUS_ACCESSORY
+  - Updated MANA_EQUIPMENT to include 'focus'
+  - Updated UTILITY_EQUIPMENT to include 'focus'
+  - Updated ALL_EQUIPMENT to use 'focus' instead of 'shield'
+
+- **Removed execute-related effects**:
+  - Removed EXECUTIONER from SPECIAL_EFFECTS
+  - Removed executioner code from store.ts combat tick
+  - Replaced ct_t2_l10_finisher upgrade with ct_t2_l10_precision (+50% crit damage)
+
+- **Updated skill descriptions**:
+  - Soul Binding: Changed to "Bind creature souls to items for unique enchantment effects"
+  - Ancient Echo: Buffed from "+1 enchantment capacity per Enchanter level" to "+2"
+
+Stage Summary:
+- All player-defense related mechanics removed (shields, thorns, lifesteal, manaShield)
+- Focus items provide spellcasting enhancement instead of defense
+- Execute effects removed (doesn't make sense in context)
+- Soul Binding and Ancient Echo skills improved
+- All lint checks pass