docs(dn): Srijan Gupta 02/22/26 (#479)

Author: Srijan1972

src/design_notebooks/2026spring/sg9109.md

@@ -14,3 +14,10 @@
 ## Week 3 (02/09/26 - 02/15/26)
 
 - I was busy this week so only did some SystemVerilog review this week.
+
+## Week 4 (02/16/26 - 02/22/26)
+
+- Attended the Wednesday meeting.
+- Completed the onboarding labs.
+- Read the first paper (About the CPU core).
+- Get to the next paper next week.