docs(bf-1ubcb): verify fuzz harness build configuration

- Confirm cargo-fuzz 0.13.1 installed
- Verify content fuzz target at fuzz/fuzz_targets/content.rs
- Build succeeds: cargo fuzz build produces all 7 fuzz target binaries
- No compilation errors or dependency issues
- Document verification in notes/bf-1ubcb.md

notes/bf-1ubcb.md

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+# Fuzz Harness Build Verification (bf-1ubcb)
+
+## Date: 2026-07-06
+
+## Summary
+Verified that the content fuzz harness is properly configured and builds successfully.
+
+## Verification Results
+
+### ✅ PASS: cargo-fuzz installation
+```
+cargo-fuzz 0.13.1
+```
+The cargo-fuzz tool is properly installed.
+
+### ✅ PASS: Content fuzz target exists
+The fuzz target is located at `fuzz/fuzz_targets/content.rs` (not `content_fuzzing_targets.rs` as mentioned in the task description - this appears to be a naming inconsistency).
+
+**Target structure:**
+- Tests INV-8 (no panic at public boundary) for content stream interpreter
+- Tests both `ProcessingMode::Normal` and `ProcessingMode::PositionHint`
+- Uses proper fuzzer setup with `libfuzzer_sys::fuzz_target!`
+- Handles all input without panic (safety invariant)
+
+### ✅ PASS: Fuzz harness builds successfully
+```
+cargo fuzz build
+```
+Completed without errors. Built binaries:
+- `content` (59MB) - the main content fuzz target
+- Additional targets: `cmap_parser`, `lexer`, `object_parser`, `profile_yaml`, `stream_decoder`, `xref`
+
+All 7 fuzz targets compiled successfully with no compilation errors.
+
+## Acceptance Criteria Status
+- ✅ `cargo fuzz --version` succeeds
+- ✅ Content fuzz target file exists (at `fuzz/fuzz_targets/content.rs`)
+- ✅ `cargo fuzz build` completes without compilation errors
+- ✅ No unresolved dependencies or build failures
+
+## Notes
+The task description referenced `content_fuzzing_targets.rs` but the actual file is `content.rs`. This appears to be a documentation discrepancy - the actual fuzz target is properly named and functional.
+
+All fuzz harness infrastructure is working correctly and ready for fuzzing operations.

notes/bf-3bnao-step4.md

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+# bf-3bnao-step4: Verify pdftract completed successfully
+
+**Date:** 2026-07-06
+**State:** FAIL
+
+## Verification Results
+
+### Exit Code Check
+- **Expected:** 0 (success)
+- **Actual:** 1 (failure)
+- **Status:** ❌ FAIL
+
+### Output Format Check
+- **Expected:** Valid JSON or expected pdftract output format
+- **Actual:** No JSON output (extraction failed before producing output)
+- **Status:** ❌ FAIL
+
+### Error Messages Check
+- **Expected:** No error messages in stderr
+- **Actual:** Error message present: "Failed to extract PDF"
+- **Status:** ❌ FAIL
+
+## Command Output Summary
+
+From step3 (bf-32by8-step3.md):
+```
+Command: unset RUST_LOG; cargo run -- extract tests/fixtures/encoding/fingerprint-match.pdf --json -
+Exit Code: 1
+Error: Failed to extract PDF
+```
+
+## Acceptance Criteria Status
+
+- ❌ Exit code from the command is 0 (success) - **FAIL** (exit code was 1)
+- ❌ Output contains valid JSON or expected pdftract output format - **FAIL** (no output produced)
+- ❌ No error messages in stderr - **FAIL** (error: "Failed to extract PDF")
+- ✅ Document verification results in notes/bf-3bnao-step4.md - **PASS** (this file)
+
+## Conclusion
+
+The pdftract command did **not** complete successfully. The PDF extraction failed with exit code 1 and error message "Failed to extract PDF". This failure needs to be investigated further. The issue could be:
+
+1. The PDF file `tests/fixtures/encoding/fingerprint-match.pdf` may be corrupted
+2. There may be a bug in the PDF extraction code
+3. There may be missing dependencies or environmental issues
+
+**This bead should NOT be closed** until the root cause is identified and fixed, and the command succeeds with exit code 0.