Fix notebook links to point at the nafisat branch (main lacks these files)

README.md

@@ -71,10 +71,10 @@ Two versions of the same train/validation/test splits are available as separate
 
 - **`default`** (used automatically if you don't pass a config name): the cleaned,
   target-filtered, leakage-removed, imputed dataset from
-  [`notebooks/00_cleaning.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/main/notebooks/00_cleaning.ipynb),
+  [`notebooks/00_cleaning.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/nafisat/notebooks/00_cleaning.ipynb),
   before feature engineering. Files under `data/before_feature_engineering/`.
 - **`feature_engineered`**: the same splits after
-  [`notebooks/02_feature_engineering.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/main/notebooks/02_feature_engineering.ipynb)
+  [`notebooks/02_feature_engineering.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/nafisat/notebooks/02_feature_engineering.ipynb)
   (engineered features added, several raw columns consolidated or dropped).
   Files under `data/after_feature_engineering/`.
 
@@ -87,7 +87,7 @@ after  = load_dataset("BuildersLab/loan-application-dataset", "feature_engineere
 
 ## Data Dictionary
 
-Reference files under `data_dictionary/`, produced while cleaning and engineering the LendingClub data (see [`notebooks/00_cleaning.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/main/notebooks/00_cleaning.ipynb) and [`notebooks/02_feature_engineering.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/main/notebooks/02_feature_engineering.ipynb)), not Kaggle's raw column list. Each has a different schema, so each CSV is declared as its own config above (see `configs:` in the metadata) rather than being auto-merged.
+Reference files under `data_dictionary/`, produced while cleaning and engineering the LendingClub data (see [`notebooks/00_cleaning.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/nafisat/notebooks/00_cleaning.ipynb) and [`notebooks/02_feature_engineering.ipynb`](https://github.com/BuildersLab/Credit-Risk-Default/blob/nafisat/notebooks/02_feature_engineering.ipynb)), not Kaggle's raw column list. Each has a different schema, so each CSV is declared as its own config above (see `configs:` in the metadata) rather than being auto-merged.
 
 - **`data_dictionary_summary.csv`**: one row per column: `Variable`, `Description`
   (LendingClub's official column definition), `Missing Values` (count),