docs(bf-35c42): document available fuzz targets

Listed 6 fuzz targets via cargo fuzz list:
- cmap_parser
- content
- lexer
- object_parser
- stream_decoder
- xref

All acceptance criteria PASSED. Verification in notes/bf-35c42.md.

notes/bf-35c42.md

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+# bf-35c42: List available fuzz targets
+
+## Task
+List all available fuzz targets in the project to understand what can be fuzzed.
+
+## Results
+Successfully ran `cargo fuzz list` and identified 6 available fuzz targets:
+
+1. **cmap_parser** - Character map parsing
+2. **content** - Content stream parsing (expected target)
+3. **lexer** - Lexical analysis/tokenization
+4. **object_parser** - PDF object parsing
+5. **stream_decoder** - Stream decoding
+6. **xref** - Cross-reference table parsing
+
+## Verification
+- ✅ `cargo fuzz list` runs without error
+- ✅ Output shows 6 fuzz targets (exceeds expectation of "at least one")
+- ✅ The expected 'content' target exists
+- ✅ Target list is readable and well-formatted
+
+## Acceptance Criteria Status
+All criteria PASSED:
+- PASS: `cargo fuzz list` runs without error
+- PASS: Output shows multiple fuzz targets including 'content'
+- PASS: Target list is readable
+
+## Notes
+The fuzzing infrastructure is properly configured with diverse targets covering different PDF parsing components, providing good coverage for security and robustness testing.