The TUI was pretty monotonous — everything rendered as flat markdown. Now the DM can use fenced blocks (```map, ```aside, ```item) that render as styled Rich Panels in a 2/3 + 1/3 column layout. Maps get heavy green borders, asides get soft rounded yellow, items get double magenta. Narrow blocks float in the right column alongside narrative text, wide blocks (big city maps) center full-width. Text always stays in the 2/3 column for comfortable reading width. A StreamClassifier state machine handles the streaming — it detects fenced block boundaries as chunks arrive, shows live previews while blocks are being drawn, and classifies everything into typed parts that build_display() arranges into the grid layout. The DM now knows its column widths (read dynamically from the terminal each turn) so it can size blocks to fit the right column. All three prompts (dm-system, planner, world-seed) encourage using display blocks generously when establishing and enriching entities. Also adds `storied play --sandbox` for throwaway sessions — no character, no world state, temp directory cleaned up on exit. Helpful for iterating on display stuff and also just fun to mess around in. Extracted display logic from cli.py into display.py so it's testable. Added pytest-cov reporting (branch coverage, term-missing, 48% threshold) and tests for display, character formatting, and session management. 216 tests at 51% coverage. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>