chore(scripts): ratchet the unpinned error-status baseline down: INVALID_REFERENCE now has a producer that declares its status

Regenerated with `node scripts/check-error-status-conformance.mjs --update`
and nothing else.

Claude-Session: https://claude.ai/code/session_017ErfyP2Rx7XWHJA27QjyUi
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

scripts/error-status-unpinned-baseline.json

@@ -12,7 +12,6 @@
     "INTEGRATION_ERROR",
     "INVALID_CREDENTIALS",
     "INVALID_FORMAT",
-    "INVALID_REFERENCE",
     "INVALID_TOKEN",
     "IP_RESTRICTED",
     "LICENSE_REQUIRED",