f879d54721d08ff5b510d2aa84a7704e3d2776f2
Add `--demo` (and the RDBMS_PLAYGROUND_DEMO env fallback) to enter demonstration mode, threaded onto App.demo_mode through run_loop — mirrors the --no-undo plumbing. Off by default, zero footprint when off. The --help line advertises only the visible keystroke badges; the Ctrl+] caption trigger is kept low-profile (ADR-0047 D6 updated). Phase A of ADR-0047; behaviour (badges/captions) lands in B and C.
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