Add dump.py and load.py for one-time stdin/stdout database I/O

[Copilot]

Implementation Complete ✓

Successfully implemented dump.py and load.py as one-time I/O operations.

✅ dump.py

• One-time read from database and output to stdout
• Outputs ideas first, then facts
• Uses unparse() to format output
• No continuous monitoring (unlike output.py)
• Properly disposes of database resources

✅ load.py

• One-time read from stdin and write to database
• Parses each line and stores as fact/idea
• Handles invalid input gracefully with error messages to stderr
• Skips empty lines
• No interactive prompt (unlike input.py)
• Properly disposes of database resources

✅ Comprehensive Test Coverage

• test_dump.py: 6 tests covering all dump scenarios
• test_load.py: 8 tests covering all load scenarios
• All 42 tests pass (including existing tests)
• No linting issues
• No security vulnerabilities detected
• Pre-commit hooks pass (ruff check + ruff format)

✅ Requirements Met

• ✓ Similar to input.py/output.py but one-time operations
• ✓ Read from/write to stdin/stdout
• ✓ NOT integrated into main.py
• ✓ Tests written and passing
• ✓ Code review feedback addressed
• ✓ Pre-commit hooks passing

Original prompt

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This section details on the original issue you should resolve

<issue_title>实现一个 dump.py 和 load.py 基本和 input.py 和 output.py 一样, 不过并不是一直监听, 而是一次性的, 从/向 stdin/stdout 中读入/输出</issue_title>
<issue_description>注1. 不要集成到main中
注2. 记得写tests</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 实现一个 dump.py 和 load.py 基本和 input.py 和 output.py 一样, 不过并不是一直监听, 而是一次性的, 从/向 stdin/stdout 中读入/输出 #35

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[hzhangxyz]

过一下 precommit 的hook @copilot

[Copilot]

过一下 precommit 的hook @copilot

Pre-commit hooks have been run and all formatting issues fixed. The hooks (ruff check and ruff format) now pass successfully. Fixed trailing whitespace in load.py and test_load.py. (commit 13b52e5)