Implement BAT-006: portfolio-hub ledger integration (REQ-017~019)

- REQ-017: LedgerPort contract (application/ledger_port.py) + portfolio-hub
  adapter + in-memory stub (adapters/ledger/), TREX_PORTFOLIO_HUB_* config
- REQ-018: fill→ledger recording in execution loop; FillStatus carries
  execution_id (deterministic synth) + fee; paper/kis adapters updated
- REQ-019: ledger outbox + retry worker (application/ledger_outbox.py),
  correlation_id idempotency, outcome vocabulary; 002_create_ledger_outbox.sql
- Tests: in-memory/portfolio-hub ledger, execution ledger hook, outbox,
  domain import sweep

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

trex_core/runtime/config.py

@@ -31,6 +31,15 @@ class KISConfig:
     redis_url: str = ""   # REQ-016: optional token cache backend
 
 
+@dataclass(frozen=True)
+class PortfolioHubConfig:
+    """portfolio-hub ledger adapter config (REQ-017)."""
+
+    base_url: str
+    token: str = ""
+    timeout: float = 5.0
+
+
 @dataclass(frozen=True)
 class DaemonConfig:
     dsn: str
@@ -40,6 +49,10 @@ class DaemonConfig:
     broker: str                      # 'paper' | 'kis'
     execution_interval_sec: float
     kis: Optional[KISConfig] = None
+    # REQ-017/019: ledger writer config (None => in-memory stub ledger,
+    # appropriate for slice-1 paper-broker integration tests).
+    portfolio_hub: Optional[PortfolioHubConfig] = None
+    ledger_interval_sec: float = 1.0
 
     @staticmethod
     def from_env() -> "DaemonConfig":
@@ -61,6 +74,14 @@ class DaemonConfig:
                 allow_live=os.environ.get("TREX_KIS_ALLOW_LIVE", "").lower() in ("1", "true", "yes"),
                 redis_url=os.environ.get("TREX_KIS_REDIS_URL", ""),
             )
+        portfolio_hub: Optional[PortfolioHubConfig] = None
+        pf_base = os.environ.get("TREX_PORTFOLIO_HUB_BASE_URL", "").strip()
+        if pf_base:
+            portfolio_hub = PortfolioHubConfig(
+                base_url=pf_base,
+                token=os.environ.get("TREX_PORTFOLIO_HUB_TOKEN", "").strip(),
+                timeout=float(os.environ.get("TREX_PORTFOLIO_HUB_TIMEOUT", "5")),
+            )
         return DaemonConfig(
             dsn=dsn,
             total_slots=int(os.environ.get("TREX_TOTAL_SLOTS", "10")),
@@ -69,4 +90,6 @@ class DaemonConfig:
             broker=broker,
             execution_interval_sec=float(os.environ.get("TREX_EXECUTION_INTERVAL_SEC", "1.0")),
             kis=kis,
+            portfolio_hub=portfolio_hub,
+            ledger_interval_sec=float(os.environ.get("TREX_LEDGER_INTERVAL_SEC", "1.0")),
         )