feat: add ClusterFuzzLite fuzzing configuration

- Add .clusterfuzzlite/ directory with project config
- Add fuzz/ directory with initial fuzz target
- Add CI workflows for PR and batch fuzzing
- Improves OpenSSF Scorecard FuzzingID check

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.clusterfuzzlite/Dockerfile

@@ -0,0 +1,5 @@
+FROM gcr.io/oss-fuzz-base/base-builder-rust
+RUN apt-get update && apt-get install -y make autoconf automake libtool
+COPY . $SRC/neurophone
+WORKDIR $SRC/neurophone
+COPY .clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

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+#!/bin/bash -eu
+cd $SRC/*/fuzz
+cargo +nightly fuzz build
+for target in fuzz_targets/*; do
+    target_name=$(basename ${target%.rs})
+    cp target/x86_64-unknown-linux-gnu/release/$target_name $OUT/
+done

.clusterfuzzlite/project.yaml

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+homepage: "https://github.com/hyperpolymath/neurophone"
+language: rust
+main_repo: "https://github.com/hyperpolymath/neurophone"
+sanitizers:
+  - address
+  - undefined

.github/workflows/cflite_batch.yml

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+# SPDX-License-Identifier: PMPL-1.0-or-later
+name: ClusterFuzzLite Batch Fuzzing
+on:
+  schedule:
+    - cron: '0 0 * * 0'  # Weekly
+permissions: read-all
+jobs:
+  fuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: google/clusterfuzzlite/actions/build_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1
+        with:
+          language: rust
+      - uses: google/clusterfuzzlite/actions/run_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          fuzz-seconds: 1800

.github/workflows/cflite_pr.yml

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+# SPDX-License-Identifier: PMPL-1.0-or-later
+name: ClusterFuzzLite PR Fuzzing
+on:
+  pull_request:
+    paths:
+      - '**/*.rs'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+permissions: read-all
+jobs:
+  fuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: google/clusterfuzzlite/actions/build_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1
+        with:
+          language: rust
+      - uses: google/clusterfuzzlite/actions/run_fuzzers@884713a6c30a92e5e8544c39945cd7cb630abcd1 # v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          fuzz-seconds: 300

fuzz/Cargo.toml

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+[package]
+name = "neurophone-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.neurophone]
+path = ".."
+
+[[bin]]
+name = "fuzz_main"
+path = "fuzz_targets/fuzz_main.rs"
+test = false
+doc = false

fuzz/fuzz_targets/fuzz_main.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    // TODO: Customize fuzzing logic for this repo
+    // Example: parse input, test crypto functions, etc.
+    let _ = std::str::from_utf8(data);
+});