Add .gitignore and initial project files

examples/demo_tui.py

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+"""Self-contained curses TUI used to exercise the tmux-shot pipeline.
+
+Arrow keys move the '@' cursor, 'q' quits. No external dependencies beyond
+the standard library, so the demo works without any other TUI installed.
+"""
+import curses
+
+
+def main(stdscr: "curses._CursesWindow") -> None:
+    curses.curs_set(0)
+    curses.start_color()
+    curses.use_default_colors()
+    for i in range(1, 8):
+        curses.init_pair(i, i, -1)
+
+    y, x = 5, 10
+    while True:
+        stdscr.erase()
+        stdscr.addstr(0, 0, "tmux-shot demo TUI -- arrows to move, q to quit", curses.A_BOLD)
+        for i in range(1, 8):
+            stdscr.addstr(2, i * 4, f" {i} ", curses.color_pair(i) | curses.A_REVERSE)
+        stdscr.addstr(y, x, "@", curses.color_pair(2) | curses.A_BOLD)
+        stdscr.refresh()
+
+        ch = stdscr.getch()
+        if ch in (ord("q"), ord("Q")):
+            break
+        elif ch == curses.KEY_UP:
+            y = max(3, y - 1)
+        elif ch == curses.KEY_DOWN:
+            y += 1
+        elif ch == curses.KEY_LEFT:
+            x = max(0, x - 1)
+        elif ch == curses.KEY_RIGHT:
+            x += 1
+
+
+if __name__ == "__main__":
+    curses.wrapper(main)