docs(wiki): #1620 — record the code-review hardening and scope the 'other screens' note
docs(wiki): #1620 — expired session on the initial load of Assign Test Project Roles Wiki page Task-Issue-1620-...-Initial-Load-Session-Expired.md (gap vs legacy usersAssign.php:23 checkSessionValid) + the 'Expired Session' section in the User Management page + 4 screenshots (healthy, dead screen before, login bounce, neutralised state).