Prefer stock display names in IPO reports

Request:
Rename the report display-name rule from 中文名 to 股票名, prefer Chinese stock-style short names, and allow sourced English stock names such as MERDEKAGOLD-DRS when no Chinese short name exists.

Changes:
- Update the hk-ipo-analyst skill to require a 股票名 column and document English stock-name fallback.
- Derive missing stock_short_name values from archived market-heat source-page stock names in the analysis dataset.
- Preserve source-page stock names into ipo_master when future market-heat archives encounter blank stock_short_name values.
- Rename the single-ticker report display helper to stock_display_name.
- Refresh the latest report and README so 06228 displays as MERDEKAGOLD-DRS and tables use 股票名.

Verification:
- python3 /root/.codex/skills/.system/skill-creator/scripts/quick_validate.py .agents/skills/hk-ipo-analyst
- git diff --check
- .venv/bin/python -m py_compile scripts/archive_t0_5_market_heat.py scripts/build_analysis_dataset.py scripts/generate_ipo_report.py
- Rebuilt analysis_model_v0_dataset.csv for 2026-06-23T10:59:36Z
- Verified 06228 stock_short_name is MERDEKAGOLD-DRS and latest README matches the dated report

scripts/build_analysis_dataset.py

@@ -71,6 +71,14 @@ def offer_size_hkd_m(row: sqlite3.Row) -> float | None:
     return None
 
 
+def stock_name_from_market_heat_notes(notes: str | None) -> str | None:
+    if not notes or "Stock name on source page:" not in notes:
+        return None
+    value = notes.split("Stock name on source page:", 1)[1].strip()
+    value = value.split(". Prospectus URL shown by source:", 1)[0].strip()
+    return value or None
+
+
 def success_rate(row: sqlite3.Row) -> float | None:
     valid = as_int(row["valid_applications"])
     successful = as_int(row["successful_applications"])
@@ -420,6 +428,7 @@ def fetch_rows(conn: sqlite3.Connection) -> list[sqlite3.Row]:
           h.provider AS t0_5_provider,
           h.margin_subscription_multiple AS t0_5_margin_subscription_multiple,
           h.source_id AS t0_5_source_id,
+          h.notes AS market_heat_notes,
           eh.one_hand_win_rate_pct AS external_one_hand_win_rate_pct,
           eh.public_oversubscription_times AS external_public_oversubscription_times,
           eh.grey_market_return_pct AS external_grey_market_return_pct,
@@ -461,13 +470,14 @@ def build_records(rows: list[sqlite3.Row], as_of: str) -> list[dict[str, Any]]:
         total_score = t0_score_value + (t1_score_value if structured_t1 else 0)
         t0_plus_t0_5_score = t0_score_value + t0_5_score_value if t0_5_score_value is not None else None
         size = offer_size_hkd_m(row)
+        stock_short_name = row["stock_short_name"] or stock_name_from_market_heat_notes(row["market_heat_notes"])
         record: dict[str, Any] = {
             "model_version": MODEL_VERSION,
             "analysis_as_of": as_of,
             "ticker": row["ticker"],
             "company_name_en": row["company_name_en"],
             "company_name_zh": row["company_name_zh"],
-            "stock_short_name": row["stock_short_name"],
+            "stock_short_name": stock_short_name,
             "board": row["board"],
             "status": row["status"],
             "listing_date": row["listing_date"],