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/Chalkboard

@@ -0,0 +1,22 @@
+palette = 0=#000000
+palette = 1=#c37372
+palette = 2=#72c373
+palette = 3=#c2c372
+palette = 4=#7372c3
+palette = 5=#c372c2
+palette = 6=#72c2c3
+palette = 7=#d9d9d9
+palette = 8=#585858
+palette = 9=#dbaaaa
+palette = 10=#aadbaa
+palette = 11=#dadbaa
+palette = 12=#aaaadb
+palette = 13=#dbaada
+palette = 14=#aadadb
+palette = 15=#ffffff
+background = #29262f
+foreground = #d9e6f2
+cursor-color = #d9e6f2
+cursor-text = #29262f
+selection-background = #073642
+selection-foreground = #ffffff