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/Pencil Light

@@ -0,0 +1,22 @@
+palette = 0=#212121
+palette = 1=#c30771
+palette = 2=#10a778
+palette = 3=#a89c14
+palette = 4=#008ec4
+palette = 5=#523c79
+palette = 6=#20a5ba
+palette = 7=#b3b3b3
+palette = 8=#424242
+palette = 9=#fb007a
+palette = 10=#52caa2
+palette = 11=#c0b100
+palette = 12=#20bbfc
+palette = 13=#6855de
+palette = 14=#4fb8cc
+palette = 15=#f1f1f1
+background = #f1f1f1
+foreground = #424242
+cursor-color = #20bbfc
+cursor-text = #424242
+selection-background = #b6d6fd
+selection-foreground = #424242