refactor: rename stock-lab → stock (graduation)

- git mv stock-lab/ → stock/
- docker-compose.yml: 서비스 키 + container_name + build.context +
  frontend.depends_on + agent-office STOCK_LAB_URL → STOCK_URL
- agent-office/app: config.py, service_proxy.py, agents/stock.py, tests/
  STOCK_LAB_URL → STOCK_URL
- nginx/default.conf: proxy_pass http://stock-lab → http://stock (3 lines)
- CLAUDE.md / README.md / STATUS.md / scripts/ 문구 갱신
- stock/ 내부 자기 참조 갱신

lab 네이밍 정책 (feedback_lab_naming.md) graduation.
API URL / Python import / DB 파일명 변경 없음.

stock/app/screener/ai_news/telegram.py

@@ -0,0 +1,73 @@
+"""ai_news Top 5/5 텔레그램 메시지 빌더 (MarkdownV2)."""
+
+from __future__ import annotations
+
+from typing import Any, Dict, List
+
+
+_MD_SPECIAL = r"_*[]()~`>#+-=|{}.!\\"
+
+
+def _escape(text: str) -> str:
+    return "".join("\\" + c if c in _MD_SPECIAL else c for c in str(text))
+
+
+def _cost_won(tokens_input: int, tokens_output: int) -> int:
+    """Claude Haiku 가격 환산 (대략): in $1/M × ₩1300, out $5/M × ₩1300."""
+    return int(tokens_input * 0.0013 + tokens_output * 0.0065)
+
+
+def _row_line(idx: int, r: Dict[str, Any]) -> str:
+    score = r["score_raw"]
+    # score 문자열 자체를 _escape 통과 — '+', '-', '.' 모두 MarkdownV2 reserved
+    score_str = _escape(f"{score:+.1f}")
+    name = r.get("name") or ""
+    ticker = r["ticker"]
+    label = (
+        f"{_escape(name)} \\({_escape(ticker)}\\)"
+        if name else _escape(ticker)
+    )
+    return f"{idx}\\. {label} \\({score_str}\\) — {_escape(r['reason'])}"
+
+
+def build_message(
+    *,
+    asof: str,
+    top_pos: List[Dict[str, Any]],
+    top_neg: List[Dict[str, Any]],
+    tokens_input: int,
+    tokens_output: int,
+    mapping: Dict[str, int] | None = None,
+) -> str:
+    lines: List[str] = [
+        f"🌅 *AI 뉴스 분석* \\({_escape(asof)} 08:00\\)",
+        "",
+        "📈 *호재 Top 5*",
+    ]
+    if top_pos:
+        for i, r in enumerate(top_pos, 1):
+            lines.append(_row_line(i, r))
+    else:
+        lines.append(_escape("- (없음)"))
+
+    lines += ["", "📉 *악재 Top 5*"]
+    if top_neg:
+        for i, r in enumerate(top_neg, 1):
+            lines.append(_row_line(i, r))
+    else:
+        lines.append(_escape("- (없음)"))
+
+    cost = _cost_won(tokens_input, tokens_output)
+    mapping_part = ""
+    if mapping:
+        mapping_part = (
+            f"매핑 {mapping['hit_tickers']}/100 ticker "
+            f"\\({mapping['matched_pairs']}쌍 / articles {mapping['total_articles']}건\\) · "
+        )
+    lines += [
+        "",
+        f"_분석: 시총 상위 100종목 · {mapping_part}"
+        f"토큰 {tokens_input:,} in / {tokens_output:,} out · "
+        f"약 ₩{cost:,}_",
+    ]
+    return "\n".join(lines)