Make it possible for a card to display an option but not actually allow it to be selected. It's up to the UI layer to decide how to display options that are not enabled. The option text should probably contiain a note on why the option cannot be selected...
This simulation engine is intended for people who are interested in game design, not computer programming -- the engine wants to do all the engine stuff so the simulation can be implemented with less familiarity with the language. Generics, however, are not widely regarded as a "new programmer" thing -- even though they're surprisingly familiar, in the end (slice-of-T, map-from-K-to-V). So a long comment explaining a bit about what's going on seems warranted.
InfoPanels are information displays that do not cost actions. One of them (the Prompt) is shown at the main menu; others can be made available as options in the menu, ether on an ongoing basis or for the current/next turn only.
Allow a pattern of multiple actions per turn. Card options can "refund" an action to the player if they should be free, or zero out the remaining actions if they should force the turn to go directly to the simulation step.
Deck does enough stuff it should be its own thing; its internal representation might change to make multiple insertions not quadratic, among other reasons. Currently it just does the obvious stuff, though. Allows inserting cards in random or specific slots and drawing cards. Shuffling a range of the deck comes later.
