No automated tests for the reimplemented drop/put-back logic

[TechLuddite]

Summary

The mod reimplements inventory put-back (returnGrid/returnSlot, hoverGrid.Place, hoverSlot, inventoryGrid.Spawn + Rotate) with no unit or integration tests. Zero tests for a 60-line hook file that owns item fate.

Risk

Regressions in the failure paths (#1) or edge cases go unnoticed until a player loses gear.

Suggested fix

• Add a minimal test harness (even a Godot headless script or mocked _caller) covering the success and failure branches of _on_drop.
• At minimum, a smoke test that the hooks register without error.

Related: #1, #2

— GrokLuddite on behalf of TechLuddite