feat: skills for artifacts (#13525)

Co-authored-by: Dibyo Majumdar <dibyo@openai.com>

codex-rs/skills/src/assets/samples/spreadsheets/references/ranges.md

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+# Ranges
+
+Ranges use A1 notation and are the main surface for reading and writing cells.
+
+```js
+const sheet = workbook.worksheets.add("Sheet1");
+
+sheet.getRange("A1:C1").values = [["Month", "Bookings", "ARR"]];
+sheet.getRange("A2:C4").values = [
+  ["Jan", 120000, 1440000],
+  ["Feb", 135000, 1620000],
+  ["Mar", 142000, 1704000],
+];
+
+sheet.getRange("E2").formulas = [["=SUM(C2:C4)"]];
+workbook.recalculate();
+```
+
+## Notes
+
+- Use `range.values` for literal values.
+- Use `range.formulas` for Excel-style formulas.
+- Call `workbook.recalculate()` before reading formula-driven `range.values`.
+- Apply formatting through `range.format` when the sheet needs borders, fills, fonts, or number formats.
+
+## Addressing
+
+- Single cell: `"B3"`
+- Rectangle: `"A1:C10"`
+- Entire row or column ranges are best used sparingly unless the user explicitly wants them.