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/Firewatch

@@ -0,0 +1,22 @@
+palette = 0=#585f6d
+palette = 1=#d95360
+palette = 2=#5ab977
+palette = 3=#dfb563
+palette = 4=#4d89c4
+palette = 5=#d55119
+palette = 6=#44a8b6
+palette = 7=#e6e5ff
+palette = 8=#585f6d
+palette = 9=#d95360
+palette = 10=#5ab977
+palette = 11=#dfb563
+palette = 12=#4c89c5
+palette = 13=#d55119
+palette = 14=#44a8b6
+palette = 15=#e6e5ff
+background = #1e2027
+foreground = #9ba2b2
+cursor-color = #f6f7ec
+cursor-text = #b7b8a8
+selection-background = #2f363e
+selection-foreground = #7d8fa4