WIP: restore lost C behaviors (schtick message, forced redraw, greeting)

Incomplete checkpoint, preserved after the implementing session hit a
capacity limit partway through mutation verification. NOT reviewed and NOT
gate-clean: make fmt has not been run, so fmt-check currently fails on
ARCHITECTURE.md and TODO.md.

Work still outstanding before this is fit for review:
  - run make fmt and fold the result in
  - finish mutation-proving each of the three behaviors
  - verify every message string byte-for-byte against the C sources
  - confirm TestSeedCompatItemTables passes with its golden untouched

Refs #13.

game/tables.go

@@ -785,7 +785,10 @@ func newGameData() *gameData {
 			},
 			CTRL('R'): func(g *RogueGame) {
 				g.After = false
-				g.refresh()
+				// C forces a full repaint here (clearok + wrefresh on
+				// curscr), not the diffing refresh: the command exists
+				// for screens the game's own record no longer matches.
+				g.repaint()
 			},
 			'v': func(g *RogueGame) {
 				g.After = false