Maze Solver T5 — L2: model the Maze as a 2D array

[tytremblay]

Parent

Part of #9 (Maze Solver module).

What to build

The student connects the arrays lesson to a real problem: the full Grid is available to their code as a 2D array, and the lesson has them read it to reason about the Maze (a foothold for a global strategy).

Expose the full Grid (2D array) to student code via the injected preamble (god's-eye: full Grid info is available to the program). Write lesson L2 (model the Maze as a 2D array) at order ~193.

Acceptance criteria

• The preamble exposes the full Grid to student code as a 2D array of Cells (open / Wall, with Start/Goal).
• Lesson L2 walks the student through reading the Grid in code and relating it to the arrays lesson.
• Lesson authored at order ~193; no new Java concept introduced.

Blocked by

• Maze Solver T4 — Compute-then-emit bridge + injected preamble + L1 + ADR #13 (T4 — bridge + preamble)