fix: 完善 UT 覆盖，统一 pytest 测试发现 - Closes #2

- 新建 pytest.ini 统一 test discovery（tests/ + skills/ir_generation_skill/tests/）
- test_step1~3 转换为 pytest 兼容格式，无输出文件时自动 skip
- 新增 tests/test_detect_conflicts.py（18 个纯函数单测）
- 新增 tests/test_config.py（7 个配置模块单测）
- CI 改为 pytest -v 使用 pytest.ini testpaths
- DEV_AGENT.md 新增 PR 提交规范

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/ir_generation_skill/tests/test_step3.py

@@ -227,6 +227,77 @@ def run_all_tests():
     return total_failures == 0
 
 
+# ═══════════════════════════════════════════════════════════════════════════════
+# pytest discovery support
+# ═══════════════════════════════════════════════════════════════════════════════
+
+import pytest  # noqa: E402
+
+
+def _load_ir_final_or_skip():
+    """Load ir_final.json or return None."""
+    try:
+        return config.load_json(config.IR_FINAL_JSON)
+    except FileNotFoundError:
+        return None
+
+
+def _load_audit_report_or_skip():
+    """Load ir_audit_report.md or return None."""
+    try:
+        with open(config.IR_AUDIT_REPORT_MD, "r", encoding="utf-8") as f:
+            return f.read()
+    except FileNotFoundError:
+        return None
+
+
+def test_step3_top_level_structure():
+    """pytest: ir_final must have required top-level fields."""
+    ir = _load_ir_final_or_skip()
+    if ir is None:
+        pytest.skip("ir_final.json not found — run step3_merge_and_audit.py first")
+    errors = check_top_level_structure(ir)
+    assert not errors, f"top-level structure errors: {errors}"
+
+
+def test_step3_rule_ids():
+    """pytest: rule_ids must be unique and follow naming convention."""
+    ir = _load_ir_final_or_skip()
+    if ir is None:
+        pytest.skip("ir_final.json not found")
+    errors = check_rule_ids(ir)
+    assert not errors, f"rule_id errors: {errors[:5]}"
+
+
+def test_step3_rule_paths():
+    """pytest: every rule must have a non-empty path array."""
+    ir = _load_ir_final_or_skip()
+    if ir is None:
+        pytest.skip("ir_final.json not found")
+    rules = ir.get("rules", [])
+    errors = check_rule_paths(rules)
+    assert not errors, f"rule path errors: {errors[:5]}"
+
+
+def test_step3_rule_completeness():
+    """pytest: each rule must have all required fields."""
+    ir = _load_ir_final_or_skip()
+    if ir is None:
+        pytest.skip("ir_final.json not found")
+    rules = ir.get("rules", [])
+    errors = check_rule_completeness(rules)
+    assert not errors, f"rule completeness errors: {errors[:5]}"
+
+
+def test_step3_audit_report():
+    """pytest: audit report must have all required sections."""
+    report = _load_audit_report_or_skip()
+    if report is None:
+        pytest.skip("ir_audit_report.md not found — run step3_merge_and_audit.py first")
+    errors = check_audit_report(report)
+    assert not errors, f"audit report errors: {errors[:5]}"
+
+
 if __name__ == "__main__":
     success = run_all_tests()
     sys.exit(0 if success else 1)