AutoCraft MineShaft v2.1 — DAI 1.9.9 Update

- Renamed the pack / experience from DAI Auto RPG 2.0 MineShaft to AutoCraft MineShaft.
- Updated pack metadata and documentation for DAI 1.9.9.
- New saves now use the AutoCraft MineShaft save name.
- Kept the internal experience id dai_auto_rpg:auto_rpg so existing saves remain discoverable.
- Retained explicit DAI 1.9.9-compatible experience controls that disable autonomous movement, combat and world editing, preserving the pack's manual gameplay policy.
- Kept DAI native void world_type generation with Nether and End disabled.
- Floors 1–10, reactions, generation functions, balance, keys, Safety Rope and progression remain unchanged.

- v0.5.5 adds a compact side-room farm off the east wall of Home and a non-destructive migration for existing saves.

- v2.1 makes Home a protected Survival hub and MineShaft floors Adventure mode.
- Safety Rope now guarantees Survival after its Home teleport.
- Uses DAI 1.9.9 cancellable break reactions for the authored Home/farm shell.
- Replaced legacy floor-unlock sigil crystals with ten floor-specific memento/trophy items.
- Added a one-time existing-save migration that reconstructs mementos from unlock progress without changing progression.

- Release version is now 2.1 instead of continuing the 0.5.x numbering line.
- pack.mcmeta now declares dai.version = 2.1 so DAI 1.9.9 can compare managed datapack versions directly while retaining the existing namespace identity for replacement matching.
