instance_test.php
Stripped-down boot harness that exercises the framework's "instance not (yet) set up" branches in src/Support/GlobalReferences.php.
Run directly via php instance_test.php - never serves an HTTP request.
Emits a single JSON line covering every branch we want to cover, so the companion cypress spec only needs one cy.exec.
Example stdout (single line, pretty-printed here for readability):
{ "zubzetNotInstantiated": "The requested instance 'ZubZet (The framework itself)' has not yet been setup.", "nonDefault": "Only the default connection is supported so far.", "allowedNullWhenUnset": true, "strictWhenUnset": "The requested instance 'Connection (Database)' has not yet been setup." }