chore: backup before code cleanup

Backup commit before executing remove-unused-code proposal.
This includes all pending changes and new features.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

openspec/changes/archive/2025-12-10-add-ocr-processing-presets/test-notes.md

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+# Test Notes – Add OCR Processing Presets
+
+Status: Manual execution not run in this environment (Paddle models/GPU not available here). Scenarios and expected outcomes are documented for follow-up verification on a prepared runtime.
+
+| Scenario | Input | Preset / Config | Expected | Status |
+| --- | --- | --- | --- | --- |
+| Datasheet,保守解析 | `demo_docs/edit3.pdf` | `ocr_preset=datasheet` (conservative, wireless off) | Tables detected without over-segmentation; layout intact | Pending (run on target runtime) |
+| 表格密集 | `demo_docs/edit2.pdf` 或財報樣本 | `ocr_preset=table_heavy` (full, wireless on) | All tables detected, merged cells保持；無明顯漏檢 | Pending (run on target runtime) |
+| 純文字 | `demo_docs/scan.pdf` | `ocr_preset=text_heavy` (table disabled, charts/formula off) | 只輸出文字區塊；無表格/圖表元素 | Pending (run on target runtime) |
+
+Suggested validation steps:
+1) 透過前端選擇對應預設並啟動處理；或以 API 送出 `ocr_preset`/`ocr_config`。
+2) 確認結果 JSON/Markdown 與預期行為一致（表格數量、元素類型、是否過度拆分）。
+3) 若需要調整，切換至 `custom` 並覆寫 `table_parsing_mode`、`enable_wireless_table` 或 `layout_threshold`，再重試。