Initial commit: add all skills files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

minimax-xlsx/references/fix.md

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+# FIX — Repair Broken Formulas in an Existing xlsx
+
+This is an EDIT task. You MUST preserve all original sheets and data. Never create a new workbook.
+
+## Workflow
+
+```bash
+# Step 1: Identify errors
+python3 SKILL_DIR/scripts/formula_check.py input.xlsx --json
+
+# Step 2: Unpack
+python3 SKILL_DIR/scripts/xlsx_unpack.py input.xlsx /tmp/xlsx_work/
+
+# Step 3: Fix each broken <f> element in the worksheet XML using the Edit tool
+#   (see Error-to-Fix mapping below)
+
+# Step 4: Pack and validate
+python3 SKILL_DIR/scripts/xlsx_pack.py /tmp/xlsx_work/ output.xlsx
+python3 SKILL_DIR/scripts/formula_check.py output.xlsx
+```
+
+## Error-to-Fix Mapping
+
+| Error | Fix Strategy |
+|-------|-------------|
+| `#DIV/0!` | Wrap: `IFERROR(original_formula, "-")` |
+| `#NAME?` | Fix misspelled function (e.g. `SUMM` → `SUM`) |
+| `#REF!` | Reconstruct the broken reference |
+| `#VALUE!` | Fix type mismatch |
+
+For the full list of Excel error types and advanced diagnostics, see `validate.md`.
+
+## Critical Rules
+
+- The output MUST contain the same sheets as the input. Do NOT create a new workbook.
+- Only modify the specific `<f>` elements that are broken — everything else must be untouched.
+- After packing, always run `formula_check.py` to confirm all errors are resolved.