- Fixed commitSkillUpgrades() to preserve upgrades from other milestones
(selecting L10 upgrades no longer resets L5 selections)
- Fixed tierUpSkill() to carry over upgrades from previous tier
(tier 2 now starts with tier 1's upgrades intact)
- Added summoned golems display to SpireTab with stats and progress bars
- Remove life, blood, wood, mental, force mana types from ELEMENTS
- Remove all spells using banned mana types
- Remove lifesteal from all remaining spells and effects
- Update guardian perks to remove lifesteal mentions
- Remove research skills for banned spell types
- Update tests to reflect new element structure
- Add BANNED CONTENT section to AGENTS.md (lifesteal/healing ban)
- Add mana types overview to README.md and AGENTS.md
- All 44 tests pass, lint clean