feat: add docfill mvp cli

examples/README.md

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+# docfill examples
+
+These examples are intentionally small and script-friendly.
+
+Run all examples through the smoke script:
+
+```bash
+bash scripts/smoke.sh
+```
+
+The smoke script copies this directory to a temp folder, generates the Office and SQLite fixture files, builds `docfill`, and runs the example tasks.
+
+## Examples
+
+- `excel-to-word`: Excel daily rows to Word daily reports.
+- `sqlite-to-excel`: SQLite summary rows to Excel department reports.

examples/excel-to-word/task.json

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+{
+  "vars": {
+    "date": "2026-06-18"
+  },
+  "data": {
+    "type": "excel",
+    "path": "./data.xlsx",
+    "sheet": "Daily",
+    "header_row": 1
+  },
+  "template": {
+    "path": "./template.docx"
+  },
+  "output": {
+    "path": "./out/daily_{{date}}_{{name}}_{{_row}}.docx",
+    "overwrite": true
+  }
+}

examples/sqlite-to-excel/task.json

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+{
+  "vars": {
+    "date": "2026-06-18"
+  },
+  "data": {
+    "type": "sqlite",
+    "path": "./data.db",
+    "query": "select department, report_date, total_count, abnormal_count from department_summary where report_date = ? order by department",
+    "params": ["{{date}}"]
+  },
+  "template": {
+    "path": "./template.xlsx"
+  },
+  "output": {
+    "path": "./out/summary_{{department}}_{{_row}}.xlsx",
+    "overwrite": true
+  }
+}