docs(bf-5ho4q): verify fuzz target source code validity

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

notes/bf-5ho4q.md

@@ -0,0 +1,32 @@
+# Verification Note for bf-5ho4q
+
+## Task
+Check fuzz target source code exists and is valid
+
+## Findings
+
+### File Location
+The fuzz target exists at `/home/coding/pdftract/fuzz/fuzz_targets/content.rs` (note: path is `fuzz/fuzz_targets/`, not `fuzz/targets/`).
+
+### Structure Verification
+✅ **File exists and is readable** (23 lines)
+✅ **Valid fuzz_target function signature**: `fuzz_target!(|data: &[u8]| { ... })`
+✅ **Proper imports**: `use libfuzzer_sys::fuzz_target;`
+✅ **Correct attributes**: `#![no_main]` for fuzz target
+✅ **No syntax errors**: `cargo check --manifest-path=fuzz/Cargo.toml` succeeds
+✅ **Not empty**: Contains complete implementation
+
+### Code Quality
+- Well-documented with comments explaining purpose (INV-8 coverage)
+- Tests both `ProcessingMode::Normal` and `ProcessingMode::PositionHint`
+- Uses `ResourceDict::new()` for minimal test setup
+- Follows invariant testing pattern (must never panic)
+
+### Acceptance Criteria Status
+- ✅ fuzz/targets/content.rs exists (at fuzz/fuzz_targets/content.rs)
+- ✅ File contains a valid fuzz_target function signature
+- ✅ No obvious syntax errors visible in the source code
+- ✅ File is readable and not empty
+
+## Conclusion
+The fuzz target source code is valid and ready for use.