diff --git a/docker-compose.override.cand.yml b/docker-compose.override.cand.yml
new file mode 100644
index 0000000..50633db
--- /dev/null
+++ b/docker-compose.override.cand.yml
@@ -0,0 +1,133 @@
+# Phase 2A — Embedding candidate compose override (Diagnose only)
+#
+# Profile-isolated: `--profile embed-cand` 명시 opt-in. default up 시 미기동.
+# production fastapi/postgres/reranker 에 영향 0.
+# 본 PR 종료 시 별 chore (PR-2A-Chunks-Cand-Cleanup-1) 에서 제거.
+#
+# 후보 상태 (2026-05-23):
+#   - me5_large_inst : ✅ smoke PASS (dim 1024)
+#   - bge_mgemma2    : ❌ Phase 2A-Extended 별 PR 이관 (9B FP16 → VRAM OOM risk + 다운로드 cost)
+#   - me5_ko         : ❌ 폐기 (401 Unauthorized, gated/모델명 부정확)
+#   - snowflake_l_v2 : 신규 추가 (Snowflake/snowflake-arctic-embed-l-v2.0, 2024-12, multilingual 강화)
+#
+# 사용:
+#   docker compose -f docker-compose.yml -f docker-compose.override.cand.yml \
+#     --profile embed-cand up -d embedding-cand-me5-inst
+#
+# 호출 (DS network 내부):
+#   http://embedding-cand-me5-inst:80/embed
+#   http://embedding-cand-snowflake-l-v2:80/embed
+
+services:
+  embedding-cand-me5-inst:
+    image: ghcr.io/huggingface/text-embeddings-inference:1.7
+    container_name: hyungi_document_server-embedding-cand-me5-inst-1
+    expose:
+      - "80"
+    environment:
+      - MODEL_ID=intfloat/multilingual-e5-large-instruct
+      - MAX_BATCH_TOKENS=8192
+      - MAX_CONCURRENT_REQUESTS=4
+    volumes:
+      - embedding_cand_me5_inst_cache:/data
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: 1
+              capabilities: [gpu]
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    profiles: ["embed-cand"]
+
+  embedding-cand-snowflake-l-v2:
+    image: ghcr.io/huggingface/text-embeddings-inference:1.7
+    container_name: hyungi_document_server-embedding-cand-snowflake-l-v2-1
+    expose:
+      - "80"
+    environment:
+      - MODEL_ID=Snowflake/snowflake-arctic-embed-l-v2.0
+      - MAX_BATCH_TOKENS=8192
+      - MAX_CONCURRENT_REQUESTS=4
+    volumes:
+      - embedding_cand_snowflake_l_v2_cache:/data
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: 1
+              capabilities: [gpu]
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    profiles: ["embed-cand"]
+
+  # ===== 비활성 후보 (Phase 2A-Extended 별 PR 이관 또는 폐기) =====
+  # 진단 박제만 보존. 본 PR scope 외.
+
+  embedding-cand-bge-mgemma2:
+    image: ghcr.io/huggingface/text-embeddings-inference:1.7
+    container_name: hyungi_document_server-embedding-cand-bge-mgemma2-1
+    expose:
+      - "80"
+    environment:
+      - MODEL_ID=BAAI/bge-multilingual-gemma2
+      - MAX_BATCH_TOKENS=8192
+      - MAX_CONCURRENT_REQUESTS=4
+    volumes:
+      - embedding_cand_bge_mgemma2_cache:/data
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: 1
+              capabilities: [gpu]
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 300s
+    profiles: ["embed-cand-extended"]   # 본 PR 미사용. extended 별 profile.
+
+  embedding-cand-me5-ko:
+    image: ghcr.io/huggingface/text-embeddings-inference:1.7
+    container_name: hyungi_document_server-embedding-cand-me5-ko-1
+    expose:
+      - "80"
+    environment:
+      - MODEL_ID=dragonkue/multilingual-e5-large-ko
+      - MAX_BATCH_TOKENS=8192
+      - MAX_CONCURRENT_REQUESTS=4
+    volumes:
+      - embedding_cand_me5_ko_cache:/data
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: 1
+              capabilities: [gpu]
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    profiles: ["embed-cand-disabled"]   # 401 fail. 사용 X.
+
+volumes:
+  embedding_cand_me5_inst_cache:
+  embedding_cand_snowflake_l_v2_cache:
+  embedding_cand_bge_mgemma2_cache:
+  embedding_cand_me5_ko_cache:
diff --git a/tests/fixtures/ollama_bge_m3_embedding_response.json b/tests/fixtures/ollama_bge_m3_embedding_response.json
new file mode 100644
index 0000000..8c57a51
--- /dev/null
+++ b/tests/fixtures/ollama_bge_m3_embedding_response.json
@@ -0,0 +1,17 @@
+{
+  "model_called": "bge-m3",
+  "endpoint": "http://ollama-gpu:11434/api/embeddings",
+  "input": "테스트 한국어 문장 + English mixed",
+  "response_shape": {
+    "embedding_dim": 1024,
+    "top_3_values": [
+      -0.010903210379183292,
+      -0.1681741178035736,
+      -0.24618254601955414
+    ]
+  },
+  "raw_keys": [
+    "embedding"
+  ],
+  "captured_at": "2026-05-23"
+}
diff --git a/tests/fixtures/tei_embedding_response.json b/tests/fixtures/tei_embedding_response.json
new file mode 100644
index 0000000..f957032
--- /dev/null
+++ b/tests/fixtures/tei_embedding_response.json
@@ -0,0 +1,19 @@
+{
+  "slug": "me5_large_inst",
+  "model_id": "intfloat/multilingual-e5-large-instruct",
+  "endpoint": "http://embedding-cand-me5-inst:80/embed",
+  "input": "테스트 한국어 문장 + English mixed",
+  "response_shape": {
+    "outer_type": "list",
+    "batch_size": 1,
+    "inner_type": "list",
+    "embedding_dim": 1024,
+    "top_3_values": [
+      0.020381121,
+      -0.0070679397,
+      0.001018147
+    ]
+  },
+  "note": "TEI returns nested array [[float, ...]] — Ollama 와 shape diff (Ollama = {\"embedding\": [float, ...]}). dispatcher 가 shape diff 흡수 필요.",
+  "captured_at": "2026-05-23"
+}
diff --git a/tests/fixtures/tei_embedding_snowflake_l_v2_response.json b/tests/fixtures/tei_embedding_snowflake_l_v2_response.json
new file mode 100644
index 0000000..93bd3c8
--- /dev/null
+++ b/tests/fixtures/tei_embedding_snowflake_l_v2_response.json
@@ -0,0 +1,19 @@
+{
+  "slug": "snowflake_l_v2",
+  "model_id": "Snowflake/snowflake-arctic-embed-l-v2.0",
+  "endpoint": "http://embedding-cand-snowflake-l-v2:80/embed",
+  "input": "테스트 한국어 문장 + English mixed",
+  "response_shape": {
+    "outer_type": "list",
+    "batch_size": 1,
+    "inner_type": "list",
+    "embedding_dim": 1024,
+    "top_3_values": [
+      0.07000499,
+      0.0054518348,
+      0.027516967
+    ]
+  },
+  "note": "TEI nested array shape — me5_large_inst 와 동일.",
+  "captured_at": "2026-05-23"
+}