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/Argonaut

@@ -0,0 +1,22 @@
+palette = 0=#232323
+palette = 1=#ff000f
+palette = 2=#8ce10b
+palette = 3=#ffb900
+palette = 4=#008df8
+palette = 5=#6d43a6
+palette = 6=#00d8eb
+palette = 7=#ffffff
+palette = 8=#444444
+palette = 9=#ff2740
+palette = 10=#abe15b
+palette = 11=#ffd242
+palette = 12=#0092ff
+palette = 13=#9a5feb
+palette = 14=#67fff0
+palette = 15=#ffffff
+background = #0e1019
+foreground = #fffaf4
+cursor-color = #ff0018
+cursor-text = #ff8ca4
+selection-background = #002a3b
+selection-foreground = #ffffff