add auto codegen

models/SiaN/_schema.md

@@ -0,0 +1,23 @@
+# _schema.md
+
+## Format
+
+```
+# === IMPORTS ===
+<all imports>
+
+# code: ./src/file.py
+# markdown
+"""Description"""
+
+# inline:
+<custom code>
+```
+
+## Directives
+
+- `# code:` - include file from src/
+- `# markdown` - description block
+- `# inline:` - custom code cell
+
+`build.py` generates notebook from `_schema.py`.