feat(resources): bundle color themes and compiled xterm-ghostty terminfo

Makes the resources directory self-contained like Ghostty's share/ghostty:
- themes/: the 463 iTerm2-Color-Schemes themes Ghostty 1.3.1 ships
  (release 20260216-151611-fc73ce3), with the upstream MIT license.
- terminfo/: xterm-ghostty compiled with `tic -x` from the terminfo
  source generated by ghostty-termio; `infocmp -x` is identical to the
  installed Ghostty's entry.

The generator script and resources-dir discovery changes follow in a
separate commit.

Test Plan:
- TERMINFO=resources/terminfo infocmp -x xterm-ghostty

resources/themes/Arthur

@@ -0,0 +1,22 @@
+palette = 0=#3d352a
+palette = 1=#cd5c5c
+palette = 2=#86af80
+palette = 3=#e8ae5b
+palette = 4=#6495ed
+palette = 5=#deb887
+palette = 6=#b0c4de
+palette = 7=#bbaa99
+palette = 8=#554444
+palette = 9=#cc5533
+palette = 10=#88aa22
+palette = 11=#ffa75d
+palette = 12=#87ceeb
+palette = 13=#996600
+palette = 14=#b0c4de
+palette = 15=#ddccbb
+background = #1c1c1c
+foreground = #ddeedd
+cursor-color = #e2bbef
+cursor-text = #000000
+selection-background = #4d4d4d
+selection-foreground = #ffffff