Diagnostic for the dual-grid + blob-14 painting model: D-key toggles a per-cell text annotation rendered over the map. For each material cell on the active layer, draws "S<slot>r<rot>" (and "f" when flip=1) in green at the cell's top-left, sourced from the new lib-core.maps 0.5.5 cell_material_slot getter. Use case: confirm that the renderer actually picks distinct slots (corner_full / tee_full / cross / etc.) for painted regions rather than always picking slot 13 solid — the rectilinear style fills enough of each cell that visually adjacent slots 3/7/13 are hard to distinguish without numerical labels. Inline today; plan-stub `docs/superpowers/plans/2026-05-29-debug-overlay-extract-to-lib.md` deferred until a 2nd consumer (vagrant debug-render, puppet-editor, etc.) appears. Also bumps lib-core.maps dep 0.5.4 -> 0.5.5.
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