Add CI Python validation, fix ewm.html, update pages.yml and ci.yml workflows

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Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -59,3 +59,20 @@ jobs:
         with:
           name: dist
           path: dist/
+
+  validate-python-examples:
+    name: Validate Python Examples
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install Python dependencies
+        run: pip install pandas numpy
+
+      - name: Validate Python playground examples
+        run: python scripts/validate-python-examples.py playground/

.github/workflows/pages.yml

@@ -36,6 +36,17 @@ jobs:
       - name: Bundle TypeScript compiler for offline playground
         run: cp node_modules/typescript/lib/typescript.js ./playground/dist/typescript.js
 
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install Python dependencies
+        run: pip install pandas numpy
+
+      - name: Validate Python playground examples
+        run: python scripts/validate-python-examples.py playground/
+
       - name: Setup Pages
         uses: actions/configure-pages@v5
         with:

playground/ewm.html

@@ -542,13 +542,12 @@ <h2>9 · Custom apply</h2>
 );
 console.log("weighted sum:", ewmWeightedSum.values);</textarea>
       <textarea class="playground-python" style="display:none">import pandas as pd
-import numpy as np
 
 s = pd.Series([1, 2, 3, 4, 5])
 
 # EWM weighted sum (equivalent to unadjusted numerator)
-# Note: pandas ewm.apply() does not pass weights; custom logic needed
-ewm_weighted_sum = s.ewm(alpha=0.5).apply(lambda vals: sum(vals), raw=True)
+# Note: pandas 3.0 removed ewm().apply(); use ewm().sum() instead
+ewm_weighted_sum = s.ewm(alpha=0.5).sum()
 print("weighted sum:", list(ewm_weighted_sum))</textarea>
       <div class="playground-output">Click ▶ Run to execute</div>
       <div class="playground-hint">Ctrl+Enter to run · Tab to indent</div>