Skip clustering test: clustering_targets not in targetdb

[monodera]

Summary

• tests/test_clustering.py was causing an ImportError at collection time because clustering_targets no longer exists in the targetdb package
• Removed the module-level from targetdb import clustering_targets import
• Added @pytest.mark.skip decorator with a descriptive reason
• Kept the test body intact (with # noqa: F821) as a reference if clustering is re-introduced in the future

Test plan

• pytest tests/ collects and runs without errors
• test_run_clustering shows as SKIPPED in output
• test_relations_consistency continues to pass

🤖 Generated with Claude Code

[codacy-production]

Not up to standards ⛔

🔴 Issues 1 high

Alerts:
⚠ 1 issue (≤ 0 issues of at least minor severity)

Results:
1 new issue

Category	Results
Security	1 high

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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