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/Gruvbox Material Dark

@@ -0,0 +1,22 @@
+palette = 0=#282828
+palette = 1=#ea6962
+palette = 2=#a9b665
+palette = 3=#d8a657
+palette = 4=#7daea3
+palette = 5=#d3869b
+palette = 6=#89b482
+palette = 7=#d4be98
+palette = 8=#7c6f64
+palette = 9=#ea6962
+palette = 10=#a9b665
+palette = 11=#d8a657
+palette = 12=#7daea3
+palette = 13=#d3869b
+palette = 14=#89b482
+palette = 15=#ddc7a1
+background = #282828
+foreground = #d4be98
+cursor-color = #d4be98
+cursor-text = #282828
+selection-background = #d4be98
+selection-foreground = #282828