Thirteen read-routing callers (#4, #5, #10-#20 of the round-3 caller list) read the owner through
runtimeEnvironmentIdWithLegacyFallbackUnlessTwin. A workspace two hosts publish is no longer
searched on either host. The focus-read ratchet now counts the legacy-fallback adapter, which
reads the focused runtime inside an object literal its discovery skipped; the five F1 entries
that blind spot pruned come back. Deprecated importers 53 -> 40.