Fix nextflow pipeline config lookup

[sjh9714]

Summary

Fixes #187.

load_pipeline_config() was walking one directory too far up from scripts/utils/validators.py, so it looked for pipeline YAML files under nextflow-development/config/pipelines instead of nextflow-development/scripts/config/pipelines. This updates the lookup to the actual scripts config directory so known pipelines such as rnaseq load correctly.

Changes

• Point the validator config lookup at scripts/config/pipelines.
• Add focused unittest coverage for known and unknown pipeline config loading, plus the validator path that previously reported a known pipeline as unknown.

Testing

• PYTHONDONTWRITEBYTECODE=1 /tmp/kwork-venv/bin/python -m unittest discover -s bio-research/skills/nextflow-development/scripts/tests

I also ran the same regression assertion against an unmodified checkout before the fix and confirmed it failed because load_pipeline_config("rnaseq") returned None.

Note: I used Codex while preparing this change, reviewed the final diff, and ran the listed checks locally.

[bryan-anthropic]

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