feat(multi-instance): dcy-009 BAT-013 — RabbitMQ 다중 인스턴스 토폴로지 (REQ-048~051)

dcy-009(다중 인스턴스 RabbitMQ 토폴로지) 전체 SDLC: draft-req → confirm-req →
draft-batch(BAT-013) → run-batch-delivery → confirm-req-implemented.

- REQ-048 (Configuration): DaemonInstanceConfig.from_toml + DaemonConfig.from_config
  (env 병합, portfolio_hub_token 주입) + 데몬 --config 필수 argparse + .gitignore 인스턴스
  TOML + config/instance.example.toml
- REQ-049 (Interface): topology 동적 큐명 빌더 intent/snapshot/control_queue(instance_key)
  — default=리터럴 큐명(하위호환), named=`{base}.{instance_key}` + daemon per-instance 구독
- REQ-050 (Integration): trex.direct(topic)/trex.broadcast(fanout) exchange +
  declare_topology(instance_key) per-instance binding + control dual binding + direct_routing_key
- REQ-051 (Documentation): interface-contract/runtime-flows/project-structure 정합

하위호환: instance_key="default" → 기존 리터럴 큐명·RPC 경로 무회귀(FR-5).
split-brain 방지(NFR-3): 인스턴스 전용 큐. 민감값(NFR-4): TOML + gitignore.

검증: 신규 9 단위 + RabbitMQ 라우팅 2, 단위 271 passed,
인프라 게이트 301 passed(directed 격리 S-2 + broadcast dual S-3 + default 무회귀 S-4),
ruff clean. REQ-048~051 Implemented, BAT-013 release-candidate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

trex_core/adapters/messaging/topology.py

@@ -19,6 +19,39 @@ PAUSE_REQ_QUEUE = "trex.pause.req"      # BAT-008 / REQ-032 (legacy alias of con
 CONTROL_REQ_QUEUE = "trex.control.req"  # BAT-012 / REQ-043 operator control channel
                                         # (action: pause|resume|list|kill_switch|resume_kill_switch)
 
+# --- multi-instance topology (BAT-013 / dcy-009) ---
+DEFAULT_INSTANCE_KEY = "default"
+DIRECT_EXCHANGE = "trex.direct"        # topic, durable — directed per-instance routing (REQ-050)
+BROADCAST_EXCHANGE = "trex.broadcast"  # fanout, durable — global control to all instances (REQ-050)
+
+
+def _instance_queue(base: str, instance_key: str | None) -> str:
+    """`{base}.{instance_key}` for named instances; literal `base` for default.
+
+    The default special-case keeps existing queue names (and the entire test
+    suite + deployed clients) byte-for-byte (REQ-049 FR-5 backward-compat).
+    """
+    if instance_key in (None, DEFAULT_INSTANCE_KEY):
+        return base
+    return f"{base}.{instance_key}"
+
+
+def intent_queue(instance_key: str | None = DEFAULT_INSTANCE_KEY) -> str:
+    return _instance_queue(INTENT_REQ_QUEUE, instance_key)
+
+
+def snapshot_queue(instance_key: str | None = DEFAULT_INSTANCE_KEY) -> str:
+    return _instance_queue(SNAPSHOT_REQ_QUEUE, instance_key)
+
+
+def control_queue(instance_key: str | None = DEFAULT_INSTANCE_KEY) -> str:
+    return _instance_queue(CONTROL_REQ_QUEUE, instance_key)
+
+
+def direct_routing_key(instance_key: str, channel_type: str) -> str:
+    """Directed routing key for `trex.direct` (REQ-050): `{instance_key}.{channel_type}`."""
+    return f"{instance_key}.{channel_type}"
+
 # --- Events ---
 EVENTS_EXCHANGE = "trex.events"            # topic, durable
 EVENTS_DLQ_EXCHANGE = "trex.events.dlq"    # fanout, durable; receives unroutable/NACKed