UR-Nexus 1.68.18

• The shell is presentational and imports only ink and useTerminalSize. A first
  version read live state itself (settings, provider registry, app state, git),
  and importing it from REPL changed REPL's module graph enough to flip a
  command from hidden to visible — caught by commandRegistryIntegrity, which
  passed with the REPL edit stashed and failed with it applied. Loading a module
  is not free here; some register on load. Session values now arrive as props
  from a caller that already holds them.

• Reconstructed three more stub type files, clearing 177 further errors:
  keybindings/types.ts (six empty interfaces), ink/cursor.ts, and
  commands/plugin/unifiedTypes.ts. Same defect as the MCP types in 1.68.14 —
  an empty interface means "has no members" to TypeScript, not "shape unknown",
  so every property access on one was an error and the consuming files carried
  @ts-nocheck as a result.

• KeybindingBlock.bindings is keyed by chord string, not an array. A first
  attempt typed it ParsedBinding[], which made every entry in the default
  binding table an error — the declaration form ('ctrl+d': 'app:exit') and the
  parsed form (chord resolved into keystrokes) are different shapes, and
  conflating them broke a file that had been fine.

• KeybindingAction is a string rather than a union of known actions:
  defaultBindings.ts assembles entries conditionally from feature flags, so a
  value missing from a union would turn a working binding into an error.

• Suppression list: 140 -> 132. Eight keybinding and ink files came off.

• Totals for the sweep so far: 223 -> 132 files, 868 -> 563 errors, and almost
  none of it file-by-file. Four stub files accounted for 258 errors on their
  own.