docs(bf-5mqk0): verify cargo-fuzz toolchain installation

notes/bf-5mqk0.md

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+# bf-5mqk0: Verify cargo-fuzz toolchain is installed and working
+
+## Task Summary
+Verify that the cargo-fuzz toolchain is properly installed and functional.
+
+## Verification
+
+### Result: PASS
+
+Ran `cargo fuzz --version` and confirmed successful installation:
+
+```
+$ cargo fuzz --version
+cargo-fuzz 0.13.1
+```
+
+### Acceptance Criteria Status
+- ✅ `cargo fuzz --version` completes successfully and returns a version
+- ✅ No "command not found" errors
+- ✅ cargo-fuzz appears to be functional (version 0.13.1)
+
+## Conclusion
+The cargo-fuzz toolchain is properly installed and ready for use in fuzzing tasks.