Add trailing newlines to Rule data in output tests

[Copilot]

Rule data in output tests was missing trailing newlines, inconsistent with programmatically-generated rules throughout the codebase.

Changes

• Updated all Rule test data in tests/test_output.py to include trailing \n
  • "a\n----\nb" → "a\n----\nb\n" (Facts)
  • "x\n----\ny" → "x\n----\ny\n" (Ideas)

Context

All rule-building functions in ddss/utility.py (term_build_rule, equality_build_rule, rule_get_idea) generate rules ending with \n:

def term_build_rule(data: str) -> str:
    return f"----\n{data}\n"  # Trailing newline

def rule_get_idea(data):
    if not data.startswith("--"):
        return f"----\n{data.splitlines()[0]}\n"  # Trailing newline

Test data now follows the same convention.

Original prompt

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This section details on the original issue you should resolve

<issue_title>output的tests中，Rule的末尾应该有一个回车，这是为了保持一致性。</issue_title>
<issue_description></issue_description>

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

• Fixes output的tests中，Rule的末尾应该有一个回车，这是为了保持一致性。 #15

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[Copilot]

Pull request overview

This PR adds trailing newlines to Rule test data in tests/test_output.py to align with the format used by rule-building functions throughout the codebase.

• Updated all Rule test data strings to include trailing \n characters
• Changed both Facts and Ideas test data entries from format "a\n----\nb" to "a\n----\nb\n"

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