Fix un-runnable snippet on the "Meet the robot" lesson

[tytremblay]

Problem

Running the code on the "Meet the robot" lesson (algorithms-robot-api, page 1) failed with cannot find symbol errors for Maze, GridMaze, Robot, and grid.

The site makes only the first ```java fence per page the runnable snippet (firstJavaSnippet in site/src/lib/lessons.ts). On page 1 that was an illustrative two-liner:

Maze maze = new GridMaze(grid);
Robot robot = maze.robot();

— no import, and grid is out of scope. Auto-wrapped in a Main shell and compiled, it can't resolve any of those symbols. The complete, importing MeetTheRobot example lower on the page never got to be the runnable one.

Fix

Mark the illustrative fragment as ```text so it renders as a plain sample, promoting the full MeetTheRobot class to the page's runnable snippet.

Scope check

Audited the other three Algorithms lessons — algorithms (no java fences), algorithms-maze-data (self-contained bare-statement snippets), and algorithms-maze-solver (first fence is the full WallFollower class). This was the only lesson affected.

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