Status: IN
Architectural immunity covers all observed defect classes comprehensively: naming errors from the generation pipeline, convention drift from isolation, and tooling confusion from the test harness are all structurally invisible at runtime, with no observed defect class that could escalate from engineering nuisance to runtime failure.
Both antecedents claim immunity/invisibility from different angles; the combination claims completeness across ALL defect classes, which holds only while no export-level naming error actually breaks the test harness's import resolution
Depends on (SL): architecture-immune-to-own-engineering-defects, all-nonalgorithmic-defects-invisible-at-runtime