docs(discovery): dcy-027 모든 OQ Answered — 중장기 슬롯 운영 결정 완료

OQ-1: (a′) 기존 슬롯 도메인 유지 + 운영 프로파일/규칙 추가 (PositionBook 불필요)
OQ-2: safety_sell_enabled=false → 코어 손절매 루틴 없음, 전략 모듈 전적 책임
OQ-3: per-instance watchdog_timeout_sec 연장 (1800s 이상 권장), 알림은 후속 Discovery
OQ-4: 중장기 전략 폴링 주기 최소 1분·최대 10분

feat(bat-041): REQ-076/077/078 — watchdog timeout TOML + 중장기 운영 프로파일 + baseline

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/longterm.example.toml

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+# trex-core long-term (multi-day) instance profile (dcy-027 / REQ-077).
+# Copy to e.g. config/longterm.toml and run alongside the intraday daemon:
+#   trex-core-daemon --config config/longterm.toml
+# Real per-instance files are gitignored (they hold the portfolio-hub token).
+#
+# This profile assumes the strategy module owns ALL protection rules
+# (stop-loss / trailing / time-stop — dcy-027 OQ-2). The core provides no
+# autonomous liquidation for this instance; the only core-side backstop is
+# the operator CLI:  trex-core exit <slot>
+
+# Long-term instances MUST use their own instance_key so slots (DB scope) and
+# queues (trex.slots.req.<key> etc) never interfere with the intraday daemon
+# (dcy-027 A-2; dcy-009 topology).
+instance_key = "longterm"
+
+# portfolio-hub auth token (kept out of .env).
+portfolio_hub_token = ""
+
+trading_timezone = "Asia/Seoul"
+
+# FCFS admission cap M for this instance (REQ-060). Size to the long-term
+# portfolio's target position count.
+max_active_slots = 10
+
+# dcy-024 / REQ-048: long-term holdings must survive market close, day
+# boundaries and restarts — disable the autonomous safety-sell worker
+# (stop-loss / forced_close / market-close loops are all OFF).
+# NOTE: forced_close_at is therefore meaningless on this instance (dcy-027
+# CONFIRM) — its executor never runs here. Do not set it on long-term slots.
+safety_sell_enabled = false
+
+# dcy-027 / REQ-076: long-term strategies poll every 1-10 min (OQ-4), so the
+# intraday default (120s, env TREX_WATCHDOG_TIMEOUT) would mark them expired
+# all day. 1800s (30 min) keeps `watchdog.expired` a meaningful absence
+# signal while last_seen stays visible in slots RPC rows.
+watchdog_timeout_sec = 1800
+
+# Environment note (not TOML keys): do NOT set TREX_MARKET_CLOSE_LIQUIDATION_TIME
+# for this instance's daemon — market-close liquidation is an intraday concept.
+# (With safety_sell_enabled=false the loop is off anyway; leaving the env unset
+# keeps the intent explicit.)