Add docs/RC9_VALIDATION.md from Claro v1.17.26 zip

docs/RC9_VALIDATION.md

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+# Claro v1.09.26 RC9 Validation
+
+Validated commands:
+
+```bash
+gcc -std=c99 src/claro.c -O0 -o claro -lm
+./claro --version
+./claro test
+./claro doctor
+./claro validate
+./claro examples/simple_functions.claro
+./claro examples/text_polish.claro
+```
+
+Expected result:
+
+```text
+Claro v1.09.26
+PASS: 0 failure(s)
+Validation passed. Claro is ready for final release testing.
+```