reviewing project state, doing some tests.

test/Readme.md

@@ -1,3 +1,15 @@
-# Test
+# Baseline verification
 
-The implementation here has been gutted and will be rewritten...
+The implementation smoke is `verify_baseline.ps1`. It is not a parser corpus.
+
+From the project root, in a fresh PowerShell process:
+
+```powershell
+.\scripts\verify_baseline.ps1 -Mode positive -MirrorRoot ..\gencpp-verify-positive
+.\scripts\verify_baseline.ps1 -Mode positive -MirrorRoot ..\gencpp-verify-positive -ReuseMirror
+```
+
+The first command generates base component tables, segmented C++, single-header C++, and both C11 layouts.
+It compiles and runs the C++17 and C11 single-header host smokes. The second command reuses the same mirror.
+
+The verification wrapper copies them into the disposable mirror; it does not embed C or C++ source text.