chore: ignore venv, EDA artefacts, and session notes

[woook]

Summary

• Add .venv/ to .gitignore (virtual environment created during EDA session)
• Ignore eda_haemonc_v3_norm.py, haemonc_v3_norm_eda.ipynb, haemonc_v3_norm_eda.html — downstream analysis artefacts for the haemonc variant store EDA, not part of the pipeline
• Ignore vcf_normalisation_session_*.md — session notes

Test plan

• Verify .gitignore correctly suppresses the listed files

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This change is 

Summary by CodeRabbit

• Chores
  • Updated repository configuration to exclude development artifacts and analysis output files from version control.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3eeab507-494b-4f6a-ab34-0b2a342972b1

📥 Commits

Reviewing files that changed from the base of the PR and between f678bf5 and d745ed1.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Walkthrough

The pull request adds nine lines to .gitignore to exclude a Python virtual environment directory (.venv/) and exploratory data analysis output artifacts including Python scripts, Jupyter notebooks, HTML files, and session-specific markdown files from version control.

Changes

Cohort / File(s)	Summary
Gitignore Configuration .gitignore	Added patterns to ignore Python virtual environment (.venv/) and exploratory data analysis artifacts (EDA Python script, Jupyter notebook, HTML output, and session markdown files).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A burrow cleaned, no clutter in sight,
Virtual vines and notebooks tucked tight,
Hidden from git's all-seeing eye,
EDA sketches whispered goodbye,
Our repository hops forth, light and right!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: ignore venv, EDA artefacts, and session notes' accurately and clearly summarizes the main changes: adding gitignore patterns for a Python virtual environment, exploratory data analysis artifacts, and session notes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gitignore-venv-eda

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