  ok  N1 the normal clone finds ../felhom.eu
  ok  F1 a fixture dir inside a repo keeps its own ../felhom.eu
  ok  G1 no git at all keeps ../felhom.eu
  ok  E1 FELHOM_SHARED_SCRIPTS wins

FAIL:
  - W1 a worktree outside git/ finds the MAIN clone's sibling: resolved to /tmp/r1114-hbxrxu0g/wt/felhom.eu/scripts, want /tmp/r1114-hbxrxu0g/git/felhom.eu/scripts
