Verified fuzz/targets/content.rs exists and is valid:
- File at fuzz/fuzz_targets/content.rs (23 lines)
- Valid fuzz_target!(|data: &[u8]|) signature
- Proper imports and #![no_main] attribute
- No syntax errors (cargo check passes)
- Tests INV-8: content stream must never panic
- Covers both Normal and PositionHint processing modes
