Remove the old ability type list¶

Status: done on 2026-11-02. Runtime ability behavior remains for the owner's manual testing.

Goal¶

Remove the old AbilityType list while preserving the current reward flow and keeping Ability.cs with the ability system.

[x] Move Ability.cs and its existing Unity metadata into the ability core folder.
[x] Remove the old enum, its lookup helpers and the outdated commented check. Update older test helpers to refer to ability classes.
[x] Replace the dormant Quartet check with a general reward-card-count hook. Current special and boss rewards default to three cards. The unfinished Quartet and Quintet assets remain unchanged and are not claimed to work.
[x] Pass 12 focused Unity reward checks, including two-player modifier handling. The older Dash/status snapshot fixture still needs migration; changing its type references does not make that historical test a current gameplay check.
[x] Build a Linux IL2CPP player. Unity reported success; no real stage or gameplay was run. The generated player code includes the new identity registry and all 117 ability classes.

The definition task tracks the remaining hands-on check. See game flow tests and ability tests.