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/runtime/config.py

@@ -2,7 +2,7 @@
 from __future__ import annotations
 
 import os
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from typing import Optional
 
 
@@ -85,12 +85,44 @@ class SafetySellConfig:
     market_close_liquidation_time: Optional[str] = None  # "HH:MM" KST, optional
 
 
+@dataclass(frozen=True)
+class DaemonInstanceConfig:
+    """Per-instance TOML settings (REQ-048 / BAT-013).
+
+    `instance_key` and `portfolio_hub_token` live in a TOML file (not .env)
+    so they are not committed and so multiple instances can run distinct
+    queues. Loaded via `--config <path>.toml`.
+    """
+
+    instance_key: str
+    portfolio_hub_token: str = ""
+
+    @staticmethod
+    def from_toml(path: str) -> "DaemonInstanceConfig":
+        import tomllib
+
+        with open(path, "rb") as fh:
+            data = tomllib.load(fh)
+        instance_key = data.get("instance_key")
+        if not instance_key:
+            raise RuntimeError(
+                f"instance TOML missing required 'instance_key': {path}"
+            )
+        return DaemonInstanceConfig(
+            instance_key=str(instance_key),
+            portfolio_hub_token=str(data.get("portfolio_hub_token") or ""),
+        )
+
+
 @dataclass(frozen=True)
 class DaemonConfig:
     dsn: str
     total_slots: int
     broker: str                      # 'paper' | 'kis'
     execution_interval_sec: float
+    # BAT-013 / REQ-049: instance identity for multi-instance queue naming.
+    # "default" keeps legacy literal queue names (backward-compat).
+    instance_key: str = "default"
     kis: Optional[KISConfig] = None
     # REQ-011: paper broker tuning (only consulted when broker == 'paper').
     paper: PaperBrokerConfig = PaperBrokerConfig()
@@ -179,3 +211,18 @@ class DaemonConfig:
             snapshot_schedule=snapshot_schedule,
             safety_sell=safety_sell,
         )
+
+    @staticmethod
+    def from_config(toml_path: str) -> "DaemonConfig":
+        """Build config from env + a per-instance TOML file (REQ-048 / BAT-013).
+
+        `instance_key` and `portfolio_hub_token` come from TOML (not .env).
+        TOML `portfolio_hub_token` overrides the (env-derived) PortfolioHubConfig
+        token when a portfolio-hub base_url is configured.
+        """
+        base = DaemonConfig.from_env()
+        inst = DaemonInstanceConfig.from_toml(toml_path)
+        pf = base.portfolio_hub
+        if inst.portfolio_hub_token and pf is not None:
+            pf = replace(pf, token=inst.portfolio_hub_token)
+        return replace(base, instance_key=inst.instance_key, portfolio_hub=pf)