Add docs/RC2_VALIDATION.md from Claro v1.17.26 zip

docs/RC2_VALIDATION.md

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+# Claro RC2 Validation
+
+Validated commands:
+
+```bash
+gcc -std=c99 src/claro.c -O0 -o claro -lm
+./claro --version
+./claro test
+```
+
+Expected result:
+
+```text
+Claro RC2
+PASS: 0 failure(s)
+```
+
+Manual Windows equivalent:
+
+```powershell
+gcc -std=c99 src\claro.c -O0 -o claro.exe -lm
+.\claro.exe --version
+.\claro.exe test
+```
+
+Interactive smoke test:
+
+```powershell
+.\claro.exe examples\quiz.claro
+```
+
+Use answers like:
+
+```text
+Johnathan
+4
+10
+```
+
+Expected final score:
+
+```text
+2
+Great job!
+```