Check in initial JSON file with piper internal release cut CL

We'll automate updating this in a followup.

The Piper CL # corresponds to the "PiperOrigin-RevId:" in a commit message, e.g. "PiperOrigin-RevId: 728717544" from fdda0c3

#4220

PiperOrigin-RevId: 729548934

Author: lauraharker

.github/piper-cut-cl.json

@@ -0,0 +1,4 @@
+{
+  "piper_cut_cl": "728429268",
+  "version_id": "v20250218"
+}