chore: initialize project scaffold with meson build system, CI workflow, config, and source stubs

config/rt.conf.example

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+[font]
+family=JetBrains Mono
+size=11
+antialiasing=true
+hinting=true
+subpixel=true
+scale=1.0
+
+[theme]
+name=Dracula
+dark_mode=true
+background_opacity=1.0
+
+[terminal]
+scrollback_lines=10000
+scroll_on_output=false
+scroll_on_keystroke=true
+bold_is_bright=true
+cursor_blink=true
+cursor_shape=block
+word_chars=-A-Za-z0-9,./?%&#:_=+@~
+
+[bell]
+audible=false
+visual=true
+
+[shell]
+command=/bin/bash
+login_shell=true
+
+[shortcuts]
+copy=<Ctrl><Shift>c
+paste=<Ctrl><Shift>v
+new-tab=<Ctrl><Shift>t
+close-tab=<Ctrl><Shift>w
+next-tab=<Ctrl>Page_Down
+prev-tab=<Ctrl>Page_Up
+zoom-in=<Ctrl>plus
+zoom-out=<Ctrl>minus
+zoom-reset=<Ctrl>0
+fullscreen=F11