Updates for Documentation

ignition/CLAUDE.md

@@ -108,6 +108,19 @@ Changing the PLC program only requires updating `LinkPath` and `LinkData`.
 
 ## Scripting
 
+### Jython 2.7 Constraints
+
+All scripts in `ignition/project/` run Jython 2.7. Violating these causes runtime errors:
+
+- NO f-strings → use `"text {}".format(val)` or `"text %s" % val`
+- NO walrus operator `:=`
+- NO `pathlib` → use `os.path`
+- NO type hints → no `def foo(x: int) -> str:`
+- NO `dataclasses`, `enum.auto()`, `asyncio`
+- NO dictionary unpacking `{**d1, **d2}` → use `d1.update(d2)`
+- NO `yield from` → use explicit loops
+- Imports: `system.*` for Ignition API, standard Java/Jython libs only
+
 ### Project Library Scripts (`script-python/`)
 
 Jython 2.7 — see root CLAUDE.md for language constraints.