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* feat: add fuzzing targets for untrusted input parsers Add cargo-fuzz infrastructure with 5 fuzz targets exercising security-critical code paths: - fuzz_safety_sanitizer: Aho-Corasick + regex injection detection - fuzz_safety_validator: Input validation (length, encoding, patterns) - fuzz_leak_detector: Secret leak scanning (API keys, tokens) - fuzz_tool_params: Tool parameter JSON validation - fuzz_config_env: TOML/JSON config parsing Each target exercises real IronClaw business logic with invariant assertions. Includes corpus directories and setup documentation. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: improve fuzz targets to exercise real IronClaw code paths - fuzz_config_env: exercise SafetyLayer end-to-end (sanitize, validate, policy check) instead of generic TOML/JSON parsing - fuzz_tool_params: add validate_tool_schema coverage alongside validate_tool_params - Add "fuzz" to workspace exclude in root Cargo.toml - Update README descriptions to match actual target behavior [skip-regression-check] Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: replace redundant detect() call with meaningful invariant assertion Replace the double sanitize()+detect() call with an assertion that critical severity warnings always trigger content modification. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: rewrite fuzz_config_env to exercise IronClaw safety code directly Replace SafetyLayer wrapper usage with direct Sanitizer, Validator, and LeakDetector instantiation and invocation. Adds meaningful consistency assertions (non-empty output, valid-means-no-errors, scan/clean agreement). Removes the config construction that was only exercising struct instantiation. [skip-regression-check] Co-Authored-By: Claude Opus 4.6 <[email protected]> --------- Co-authored-by: Claude Opus 4.6 <[email protected]>