F419 static and structural checks

build LLVM 18 SymCC: PASS (no work remaining)
build LLVM 17 SymCC: PASS (no work remaining)
py_compile changed Python modules: PASS
ruff check changed Python modules and delivery verifier: PASS
git diff --check: PASS
technology index update/check: PASS
JSON and JUnit XML parse: PASS
changed-source trailing whitespace scan: PASS
diagram render and visual inspection: PASS
diagram PNG dimensions: 2400x1470 RGB
focused fixture files: 3
focused RUN commands: 24 (16 default/generated, 2 big-endian, 6 fallback)
v9 schema references in strict consumer/checker: 28
F419 LLVM17 focused: 3/3 PASS
F419 LLVM18 focused: 3/3 PASS
F416--F419 LLVM17 related: 9/9 PASS
F416--F419 LLVM18 related: 9/9 PASS
F419 Python targeted: 6/6 PASS
F416--F419 Python related: 21/21 PASS
full Python gate: 1097 tests + 250 subtests PASS
full LLVM17 controlled gate: 292 PASS + 2 existing UNSUPPORTED