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/Rebecca

@@ -0,0 +1,22 @@
+palette = 0=#12131e
+palette = 1=#dd7755
+palette = 2=#04dbb5
+palette = 3=#f2e7b7
+palette = 4=#7aa5ff
+palette = 5=#bf9cf9
+palette = 6=#56d3c2
+palette = 7=#e4e3e9
+palette = 8=#666699
+palette = 9=#ff92cd
+palette = 10=#01eac0
+palette = 11=#fffca8
+palette = 12=#69c0fa
+palette = 13=#c17ff8
+palette = 14=#8bfde1
+palette = 15=#f4f2f9
+background = #292a44
+foreground = #e8e6ed
+cursor-color = #b89bf9
+cursor-text = #292a44
+selection-background = #663399
+selection-foreground = #f4f2f9