Add simple matching method as baseline for comparison tests

- Add find_all_matches() method to DetectLogosDETR that returns all
  logos above similarity threshold without any rejection logic
- Add --matching-method simple option to test script
- Update run_comparison_tests.sh to include simple matching as Test 1
- Update documentation to describe simple matching method

logo_detection_detr_usage.md

@@ -78,6 +78,41 @@ match = detector.find_best_match(
 **Returns:**
 - Tuple of (label, similarity) for best match, or None if no match above threshold
 
+#### `find_all_matches()` - Find all matching reference logos
+
+Returns ALL logos that have at least one reference above the similarity threshold. Each unique logo appears once with its highest similarity score.
+
+```python
+matches = detector.find_all_matches(
+    detected_embedding,
+    reference_embeddings,
+    similarity_threshold=0.7
+)
+# Returns: [(label1, similarity1), (label2, similarity2), ...]
+```
+
+**Parameters:**
+- `detected_embedding`: CLIP embedding from detected logo region
+- `reference_embeddings`: List of (label, embedding) tuples for reference logos
+- `similarity_threshold`: Minimum similarity to consider a match (0-1, default: 0.7)
+
+**Returns:**
+- List of (label, similarity) tuples for all matches above threshold, sorted by similarity descending
+- Each logo appears at most once (with its highest matching reference)
+
+**Example:**
+```python
+# Get all logos that match a detection
+all_matches = detector.find_all_matches(
+    detection["embedding"],
+    reference_embeddings,
+    similarity_threshold=0.7
+)
+
+for label, similarity in all_matches:
+    print(f"Matched: {label} (similarity: {similarity:.3f})")
+```
+
 #### `detect_and_match()` - One-step detection and matching
 
 ```python