Evolving Gear v1.7

CRITICAL FIX:
- minecraft:generic.scale -> minecraft:scale for Java 26.2.
- Split Evolved Mob creation into isolated sub-functions.
- Replaced entity-type-tag scan with explicit common-mob selectors.
- Isolated Core-use item predicate from the main tick.
- Removed v1.6 repeating ambient particle loop for reliability.
- Existing mobs checked by broken builds are allowed to roll again on reload.

EXPECTED TEST:
- /function evolving_gear:evolved/test_spawn
- Large 1.25x Zombie
- Purple Evolved name
- Glowing
- 1 HP
- Guaranteed Evolution Core on death
