docs(bf-4ce3y): document profile_yaml fuzz harness verification

Verified that fuzz/fuzz_targets/profile_yaml.rs does not exist.
Acceptance criteria not met - bead should remain open for implementation.

notes/bf-4ce3y.md

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+# bf-4ce3y Verification: profile_yaml fuzz harness
+
+## Task
+Verify that the profile_yaml fuzz harness file exists and is valid.
+
+## Findings
+
+### File Existence Check
+**FAIL**: The file `fuzz/fuzz_targets/profile_yaml.rs` does **not exist**.
+
+### Existing Fuzz Harnesses
+The following fuzz harness files exist in `fuzz/fuzz_targets/`:
+- cmap_parser.rs
+- content.rs
+- lexer.rs
+- object_parser.rs
+- stream_decoder.rs
+- xref.rs
+
+### Search Results
+- No `profile_yaml` references found in the fuzz directory
+- No YAML-related functionality found in the source code that would require fuzzing
+
+## Conclusion
+The bead acceptance criteria require:
+1. ✓ fuzz/fuzz_targets/profile_yaml.rs file exists — **FAIL** (file does not exist)
+2. N/A rustc syntax check passes without errors — Cannot test without file
+3. N/A File contains a proper harness function — Cannot test without file
+
+The profile_yaml fuzz harness does not exist in the codebase. This may indicate:
+- The bead was created before the harness was implemented
+- The feature was deprioritized or removed
+- The bead references functionality that was never implemented
+
+**Recommendation**: Do not close this bead. The acceptance criteria are not met.