docs(bf-52u2q): verify fuzz/Cargo.toml workspace dependency syntax

- Verified pdftract-core workspace path resolves correctly
- Confirmed all feature flags (profiles, serde, decrypt, quick-xml, cjk) are valid
- Verified libfuzzer-sys dependency syntax is correct
- Confirmed [workspace] section prevents interference with parent workspace
- All acceptance criteria PASS

See notes/bf-52u2q.md for detailed verification results.

notes/bf-52u2q.md

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+# bf-52u2q: Verify workspace dependency syntax in fuzz/Cargo.toml
+
+## Summary
+Verified all workspace dependency syntax in fuzz/Cargo.toml. All acceptance criteria PASS.
+
+## Verification Results
+
+### 1. pdftract-core workspace path resolution ✓ PASS
+- **Path specified:** `{ path = "../crates/pdftract-core" }`
+- **Actual path from fuzz/:** `/home/coding/pdftract/crates/pdftract-core/Cargo.toml` exists
+- **Verification:** `ls -la ../crates/pdftract-core/Cargo.toml` succeeds
+- **Status:** Path resolves correctly
+
+### 2. Feature flags validity ✓ PASS
+All feature flags specified in fuzz/Cargo.toml (line 24) are valid in pdftract-core/Cargo.toml:
+
+| Feature | Valid? | Definition (pdftract-core/Cargo.toml) |
+|---------|--------|----------------------------------------|
+| `profiles` | ✓ | Line 74: `profiles = ["dep:serde_yaml"]` |
+| `serde` | ✓ | Line 68: `serde = ["dep:serde", "dep:serde_json", "dep:schemars"]` |
+| `decrypt` | ✓ | Line 75: `decrypt = ["dep:aes", "dep:rc4", "dep:md-5", "dep:cbc", "dep:cipher", "dep:digest"]` |
+| `quick-xml` | ✓ | Line 80: `quick-xml = ["dep:quick-xml"]` |
+| `cjk` | ✓ | Line 79: `cjk = []` |
+
+All 5 features are valid.
+
+### 3. libfuzzer-sys dependency syntax ✓ PASS
+- **Syntax:** `{ version = "0.4", features = ["arbitrary-derive"] }`
+- **Verification:** Standard Cargo dependency syntax, compiles without errors
+- **Status:** Correct
+
+### 4. [workspace] section interference prevention ✓ PASS
+- **Configuration:** Lines 11-12 have `[workspace]` with empty body
+- **Purpose:** Creates independent workspace shadowing parent, preventing interference
+- **Verification:** `cargo check` from fuzz/ succeeds with no warnings
+- **Status:** Correctly configured
+
+## Cargo Check Verification
+```bash
+$ cd /home/coding/pdftract/fuzz
+$ cargo check
+# No output = SUCCESS
+```
+
+## Files Verified
+- `/home/coding/pdftract/fuzz/Cargo.toml` (lines 12, 24-25)
+- `/home/coding/pdftract/crates/pdftract-core/Cargo.toml` (lines 66-80: [features])
+
+## Conclusion
+All workspace dependency syntax in fuzz/Cargo.toml is correct. No fixes needed.