Add new commands to notes CLI: ls, show, rm, search

Author: ZFancy

prototype/experiments/results/s7_oh_gpt4omini_seed44/openhands_gpt4omini_s7/workspace/notes/plan.md

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+# Notes CLI Design Plan
+
+## Overview
+This document outlines the design decisions and schema for the `notes` CLI application.
+
+## Note Schema
+- **id**: Integer, auto-increment starting from 1.
+- **title**: String, the title of the note.
+- **tags**: List of strings, tags associated with the note.
+- **body**: String, the main content of the note.
+- **citation**: String (optional), citation in BibTeX format.
+
+## Storage
+Each note will be stored as an individual JSON file in the `notes_data/` directory located at the workspace root.
+
+## Commands
+- `notes add`: Command to add a new note with the following flags:
+  - `--title`: Title of the note.
+  - `--body`: Body content of the note.
+  - `--tags`: Tags associated with the note (comma-separated).
+  - `--citation`: Optional citation in BibTeX format.
+- `notes ls`: List all notes with their id and title.
+- `notes show <id>`: Print the full contents of one note.
+- `notes rm <id>`: Delete a note by id.
+- `notes search <query>`: Substring match against title and body, case-insensitive.
+