Tensura: All the Adventure - Guild Market configuration

These files are copied to config/tensura_all_the_adventure/market on first use.
Edit the copies in config, then run /tata market reload as an operator.

Each rank file contains an "offers" array. Rank files are cumulative: a Rank C
player can roll Rankless, F, E, D, and C entries. rank_ss.json is empty by
default because SS receives the configurable discount instead of exclusive
offers.

Offer fields
------------
id                 Required unique ID. Changing it resets that offer's stock.
item               One item registry ID, such as "minecraft:diamond".
items              Optional array used to select one random registered item.
item_tag            Optional item tag used as a random item pool.
minimum_quantity   Smallest generated stack quantity.
maximum_quantity   Largest generated stack quantity, inclusive (max 4096).
unit_price         Price for each item, before quantity and price variation.
currency           bronze, silver, gold, or stellar_gold.
weight             Relative chance of selection (1-1000000; default 100).
purchase_limit     Personal purchases per rotation (1-1000; default 1).
required_mods      Optional array of required mod IDs.
enabled            Optional false value disables the entry without deleting it.

An offer needs at least one of item, items, or item_tag. Explicit and tagged
items that are not registered are ignored safely. Malformed entries are skipped
and logged instead of preventing the server from loading.

Prices use Tensura's exact 100-to-1 ladder:
100 Bronze = 1 Silver
100 Silver = 1 Gold
100 Gold = 1 Stellar Gold

The configured currency is the minimum accepted payment denomination. Higher
coins are accepted and exact lower-denomination change is returned. Quantities
and prices remain deterministic for each player's current market rotation.
