docs(bf-10vxa): verify fuzz toolchain installation

notes/bf-10vxa.md

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+# bf-10vxa: Fuzz Toolchain Installation Verification
+
+## Task
+Verify that cargo-fuzz is installed and the fuzzing toolchain is ready to use.
+
+## Verification Results
+
+### Acceptance Criteria Status
+
+**PASS** - All acceptance criteria met:
+
+1. ✅ `cargo fuzz --version` runs without error
+2. ✅ Output shows version number: `cargo-fuzz 0.13.1`
+3. ✅ No "command not found" errors
+
+### Command Output
+```bash
+$ cargo fuzz --version
+cargo-fuzz 0.13.1
+```
+
+## Conclusion
+
+The fuzz toolchain is already installed and ready to use. Version 0.13.1 is present and functioning correctly. No installation was required.
+
+## Date
+2026-07-05