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Follow up to #67 ... Shape and glyph configs were cached by font address with no eviction, so a font pushed after a popped one at the same address read the old font's configs, and the glyph config key held a pointer into scratch memory that later runs reused. Each pushed font now owns the arena its configs live in, kbts_ShapePopFont frees it and drops both caches' entries, and overrides are copied into that arena so the key compares contents.