Command (before implementation):
cd web && node --import tsx --test src/terminal-keybar.test.ts

Observed exit status: 1
Error [ERR_MODULE_NOT_FOUND]: Cannot find module 'web/src/terminal-keybar.js'
imported from web/src/terminal-keybar.test.ts

The five new mapping, one-shot, lock, sequence-preservation and pointerdown
cases were authored before the module existed. After implementation, all five
passed; the full suite passed 737 tests.