Fix Read the Docs nbsphinx kernel error

- Add environment detection to disable notebook execution on Read the Docs
- Set nbsphinx_execute = 'never' for READTHEDOCS environment
- Keep nbsphinx_execute = 'auto' for local builds
- Resolves NoSuchKernel error during Read the Docs build process

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jeremymanning

docs/conf.py

@@ -41,6 +41,14 @@
 # allow nbsphinx errors for missing optional dependencies
 nbsphinx_allow_errors = True
 
+# Don't execute notebooks during documentation build (for Read the Docs)
+# Check if we're on Read the Docs environment
+import os
+if os.environ.get('READTHEDOCS', None) == 'True':
+    nbsphinx_execute = 'never'
+else:
+    nbsphinx_execute = 'auto'
+
 # Generate the API documentation when building
 autosummary_generate = True