Constant PANEL_TITLE_ROW 

pub const PANEL_TITLE_ROW: u8 = _; // 26u8

The activity panel, drawn by the board from the fabric engine’s probes over the bottom PANEL_ROWS rows. The host writes the panel’s text (title, labels) as ordinary cells; the board paints its graphics over the cells named here, every frame, with nothing from the host:

• PANEL_TITLE_ROW: the live run-cycle count, 10 decimal digits from column PANEL_CYCLES_COL;
• PANEL_BLOCK_ROW: one tile per engine block from column PANEL_BLOCK_COL, PANEL_BLOCK_TILE columns wide, coloured by how often the block ran in the last frame (the HEAT ramp, log scale), the block running now outlined; the frame-stack gauge from PANEL_STACK_COL (a segment per frame) and the heap gauge from PANEL_HEAP_COL (a pixel per heap word);
• PANEL_CELL_ROW: one square per program cell from column PANEL_CELL_COL, two columns apart, coloured the same way, the cell being walked now outlined. The labels go on PANEL_LABEL_ROW. Tile and square counts are the engine’s caps (WPE_HW_MAXBLK, WPE_HW_MAXCELL, WPE_HW_DEPTH, WPE_HW_HEAP).