refactor: refurbish supervised ML portfolio

Author: tajamulkhann

.DS_Store

@@ -0,0 +1,26 @@
+name: Portfolio quality
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - "refactor/**"
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Validate portfolio structure and notebooks
+        run: python scripts/validate_portfolio.py

.github/workflows/portfolio-quality.yml

@@ -0,0 +1,26 @@
+# Operating-system files
+.DS_Store
+Thumbs.db
+
+# Python
+__pycache__/
+*.py[cod]
+*.so
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# Jupyter
+.ipynb_checkpoints/
+
+# Environments and local configuration
+.venv/
+venv/
+.env
+.env.*
+
+# Local model and experiment outputs
+*.joblib
+*.pkl
+mlruns/
+wandb/

.gitignore

@@ -1,10 +1,30 @@
 # Machine Learning Projects
 
-[Supervised Learning Projects](https://github.com/tajamulkhann/Machine-Learning/tree/main/Supervised%20Learning%20Projects)
+A practical machine learning portfolio by **Tajamul Khan**, organised around reproducible notebooks and clear project-level documentation.
 
-[Unsupervised Learning Projects](https://github.com/tajamulkhann/Machine-Learning/tree/main/Unsupervised%20Learning%20Projects)
+## Explore the collection
 
-<img width="1280" height="720" alt="image" src="https://github.com/user-attachments/assets/12905a9b-ac44-4115-8faa-473a666c9651" />
+| Category | Projects | What you will find |
+|---|---:|---|
+| [Supervised Learning](Supervised%20Learning%20Projects/) | 29 | Classification, regression, NLP, time-aware evaluation and interpretable pipelines |
+| [Unsupervised Learning](Unsupervised%20Learning%20Projects/) | 5 | Clustering, recommendation and pattern-discovery projects |
+
+## Portfolio standards
+
+- Problem framing, dataset provenance and exact run instructions
+- Portable paths and documented dependencies
+- Reproducible splits and leakage-safe preprocessing
+- Baselines, appropriate metrics and error analysis
+- Verified results only; no invented performance claims
+- Security checks for credentials, tokens and private paths
+
+Start with the [supervised learning project directory](Supervised%20Learning%20Projects/README.md) for the fully refurbished collection.
+
+## Author
+
+**Tajamul Khan**
+
+[GitHub](https://github.com/tajamulkhann) · [LinkedIn](https://www.linkedin.com/in/tajamulkhann/) · Instagram: `@tajamul.codes`
 
 ## Let's Connect <img src="https://github.com/JayantGoel001/JayantGoel001/blob/master/GIF/Handshake.gif" height="30px" style="max-width:100%;">