docs(bf-5gjeo): verify ExtractionResult (TestExecutionResult) struct fields

Created verification note documenting:
- TestExecutionResult struct at tests/encryption_fixtures.rs:189
- All required field accessors (exit_code, stdout, stderr, success)
- Assertion methods for encryption test validation
- Naming discrepancy note (bead refers to ExtractionResult, actual struct is TestExecutionResult)
- Location and Debug derive verified

Closes bf-5gjeo

notes/bf-5gjeo.md

@@ -0,0 +1,75 @@
+# Verification of ExtractionResult Struct Fields
+
+## Task: bf-5gjeo
+
+## Finding
+
+The bead description refers to verifying an "ExtractionResult struct" with fields:
+- exit_code: Option<i32>
+- stdout: String
+- stderr: String
+- success: bool
+
+However, after searching the codebase, I found that the relevant struct is actually **`TestExecutionResult`** (not `ExtractionResult`) located at `/home/coding/pdftract/tests/encryption_fixtures.rs:189`.
+
+## TestExecutionResult Structure
+
+**Location:** `tests/encryption_fixtures.rs:189`
+
+**Implementation:**
+```rust
+#[derive(Debug, Clone)]
+pub struct TestExecutionResult {
+    /// The underlying process output
+    pub output: std::process::Output,
+    /// Optional fixture name for better error messages
+    pub fixture_name: Option<String>,
+}
+```
+
+The struct wraps `std::process::Output` and provides methods to access the data:
+
+### Core Methods (equivalent to the required fields)
+- `exit_code() -> Option<i32>` - Line 214
+- `stdout() -> String` - Line 218
+- `stderr() -> String` - Line 223
+- `success() -> bool` - Line 229
+
+### Assertion Methods Available
+- `assert_stderr_contains(&str)` - Line 243
+- `assert_stdout_contains(&str)` - Line 255
+- `assert_exit_code(i32)` - Line 267
+- `assert_success()` - Line 282
+- `assert_failure()` - Line 294
+- `assert_output_contains(&str)` - Line 306
+- `assert_unsupported_encryption()` - Line 326
+- `assert_password_required()` - Line 351
+
+## Other Related Structs Found
+
+1. **`ExtractionResult`** (`crates/pdftract-core/src/extract.rs:237`) - Main PDF extraction result struct with fields: fingerprint, pages, metadata, signatures, form_fields, links, attachments, threads, javascript_actions. Not related to CLI testing.
+
+2. **`TestResult`** (`crates/pdftract-core/tests/TH-03-mcp-no-auth.rs:25`) - TH-03 specific test result with direct fields: passed, exit_code, stderr, stdout, bound_port.
+
+## Acceptance Criteria Verification
+
+- ✓ Struct exists with accessors for all 4 required values (via methods)
+- ✓ Field types are appropriate:
+  - exit_code: Option<i32> ✓
+  - stdout: String ✓
+  - stderr: String ✓
+  - success: bool ✓
+- ✓ Struct derives Debug for helpful test output ✓ (line 188)
+- ✓ Location documented: `tests/encryption_fixtures.rs:189`
+
+## Naming Discrepancy Note
+
+The bead and parent bead (bf-4wbf2) refer to "ExtractionResult struct" in the context of encryption test validation, but the actual struct that implements the assertion methods is `TestExecutionResult`. This appears to be a documentation/terminology discrepancy in the bead chain rather than a missing struct.
+
+## Related Structs in Test Infrastructure
+
+Other test result structs found:
+- `FixtureResult` in `crates/pdftract-core/tests/encoding_recovery.rs:148`
+- `XrefTestResult` in `crates/pdftract-core/tests/xref_integration_test.rs:30`
+- `ClassificationResult` in `crates/pdftract-core/tests/classifier_corpus.rs:68`
+- `TestResult` in `crates/pdftract-core/tests/conformance.rs:58`