Implements plan §3.9 requirement for INV-6 invariant verification.
The test runs thousands of random scenarios across various grid
dimensions (30x30 to 200x200) and multiple random seeds to verify
that no bot, energy, core, or wall position ever has coordinates
outside the valid bounds [0, rows) x [0, cols).
Test coverage:
- Random wall placement with potentially out-of-bounds input
- 1000 random Wrap() calls with positions far outside bounds
- Move() operations from edge and corner positions in all directions
- Neighbors() and VisibleFrom() return value validation
The test uses a manual random-seed loop approach for maximum
control and reproducibility, testing 6 grid sizes × 10 seeds
for comprehensive coverage of the toroidal wrapping invariant.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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