Undead Scythe

Added a new item undead_scythe that harvests souls from any mob you kill while holding it (main or off hand). Souls are stored on the item, up to 30.
Sneak + right-click cycles through five abilities; right-click activates the selected ability if you have enough souls:
- Soul Burst (2 souls, 4s cooldown): Withering shockwave around you that damages and knocks back nearby hostiles.
- Veil Step (1 soul, 2s cooldown): Short dash in the look direction with a quick speed/invisibility boost.
- Soul Ward (2 souls, 5s cooldown): Grants absorption, resistance, and fire resistance for 10 seconds.
- Grave Pact (3 souls, 6s cooldown): Summons a Soulbound Echo ally (up to 3 at once) that follows and fights for you, named after the last foe you felled.
- Soul Feast (1 soul, 3s cooldown): Bursts heal plus brief regeneration and strength.
Hits with stored souls inflict a brief Wither effect; the scythe also remembers the last soul claimed to flavor ally names.
Soulbound Echo allies last a couple of minutes, avoid hitting their owner, and hunt nearby hostile mobs while trailing the summoner.
The scythe appears in the Combat creative tab and uses a netherite hoe look by default.

Notes & tips

Abilities respect item cooldowns; if nothing happens on use, check for cooldown or soul cost.
Allies do not persist forever and cannot be bred or leashed; summon fresh ones as needed.
The mod targets Minecraft 1.20.1 on both client and server with Fabric Loader/Fabric API.

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