feat(classifier): add multilingual ECP inherence classifier POC

tests/fixtures/benchmark_24/en/contextual.md

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+# Electronics Assembly Expansion
+Foxconn is expanding its major manufacturing plants to boost production capacity for consumer electronics devices.

tests/fixtures/benchmark_24/en/contextual_expected.json

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+{
+  "expected_decision": "CONTEXTUAL_INHERENT",
+  "expected_is_inherent": true,
+  "expected_language": "en",
+  "min_confidence": 0.70
+}

tests/fixtures/benchmark_24/en/direct.md

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+# Apple Unveils Next-Generation iPhone
+
+Apple announced its flagship iPhone today, featuring an advanced custom silicon chip and upgraded camera hardware.

tests/fixtures/benchmark_24/en/direct_expected.json

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+{
+  "expected_decision": "DIRECT_INHERENT",
+  "expected_is_inherent": true,
+  "expected_language": "en",
+  "min_confidence": 0.85
+}

tests/fixtures/benchmark_24/en/ecp.json

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+{
+  "target_entity_id": "ent_apple_en",
+  "target_name": "Apple",
+  "aliases": ["Apple Inc.", "Apple"],
+  "domain": "Technology & Consumer Electronics",
+  "anchors": ["iPhone", "MacBook", "iOS", "silicon", "hardware", "smartphone", "consumer electronics", "manufacturing"],
+  "negative_anchors": [
+    "apple pie",
+    "apple pie recipe",
+    "orchard harvest"
+  ],
+  "graph_version": "1.0.0",
+  "related_entities": [
+    {
+      "entity_id": "ent_foxconn_en",
+      "name": "Foxconn",
+      "relation_type": "MANUFACTURER_FOR",
+      "weight": 0.85,
+      "scope": "manufacturing"
+    }
+  ]
+}

tests/fixtures/benchmark_24/en/not_related.md

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+# Classic Apple Pie Baking Guide
+Mix sliced cinnamon apples with brown sugar and butter before placing inside the homemade flaky apple pie crust.

tests/fixtures/benchmark_24/en/not_related_expected.json

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+{
+  "expected_decision": "NOT_RELATED",
+  "expected_is_inherent": false,
+  "expected_language": "en",
+  "min_confidence": 0.85
+}

tests/fixtures/benchmark_24/en/tangential.md

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+# Morning City Walk
+While walking through the park downtown, we noticed an Apple poster near the transit stop before heading into the coffee shop.

tests/fixtures/benchmark_24/en/tangential_expected.json

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+{
+  "expected_decision": "TANGENTIAL",
+  "expected_is_inherent": false,
+  "expected_language": "en",
+  "min_confidence": 0.30
+}