bf-4zz6e: Verify Cargo.toml profile_yaml binary configuration

Task

Ensure fuzz/Cargo.toml has the correct binary configuration for the profile_yaml fuzz harness.

PASS: fuzz/Cargo.toml has bin section with name = "profile_yaml"
- Found at lines 43-45:
```
[[bin]]
name = "profile_yaml"
path = "fuzz_targets/profile_yaml.rs"
```
PASS: The path field points to "fuzz_targets/profile_yaml.rs"
- Line 45 correctly specifies: path = "fuzz_targets/profile_yaml.rs"
- File exists: 774 bytes, verified with ls -la
PASS: libfuzzer-sys dependency is present
- Line 13: libfuzzer-sys = { version = "0.4", features = ["arbitrary-derive"] }
PASS: pdftract-core dependency includes features = ["profiles"]
- Line 12: pdftract-core = { path = "../crates/pdftract-core", features = ["profiles"] }

Confirmed profile_yaml.rs has proper libfuzzer structure:
- Uses #![no_main]
- Imports libfuzzer_sys::fuzz_target
- Implements fuzz_target!(|data: &[u8]| { ... }) macro
- Properly documented with INV-8 reference

The profile_yaml fuzz harness is correctly configured in fuzz/Cargo.toml. All binary configurations, paths, and dependencies are properly specified.