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Two presses used to discard a live sketch. The key was answered in four places that could not see each other — the inline value field, a sketch branch, a feature-card branch, and the canvas — so a press aimed at one fell through to the next, and request_exit() carried a fourth layer that deliberately let the SECOND consecutive press through to cancel_sketch(). The warning it showed first did not help: the two presses are never one decision, the first is aimed at a field or a tool and the second at whatever was underneath it. The stack is now explicit. CadLevel (DesignInteraction.hpp) is four levels deep, the enum value IS the LIFO depth, and cad_escape_level() is a constexpr function over a POD of four booleans — so the ordering that is the entire contract is checked by static_assert at compile time, with no window, GL context or event loop. DesignPanel::escape() acts on the one level escape_level() names and on no other, and every Esc in the tab routes through it. The destructive layer is gone from request_exit() itself rather than guarded at its callers, so the guarantee cannot be re-opened by adding a route: a session holding geometry is left only through Finish (keep) or Cancel (discard). Cancel now asks before discarding — it used to refuse and tell the user to press the button they had just pressed, which meant a drawn sketch could be kept but never thrown away. Right-click also stops rewarding navigation with a menu: the offer needs BOTH budgets, released within 200 ms and moved no more than 3 px, and the raycast uses the press position, so the menu describes what was pointed at rather than where the camera stopped. Two budgets because drift alone still popped a menu at the end of a slow, careful orbit. docs/ux/interaction-model.md carries the state machine, the routing and the transition table. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011FbJKJAJxxkhDTs9XdZzKA