chore: ADR-0007/0012 superseded status + admin users ID column

ADR-0007 and ADR-0012 both superseded by ADR-0013 as of 2026-05-01.
UsersTable gains a truncated ID column for quick user identification.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/admin/src/components/UsersTable.tsx

@@ -37,7 +37,7 @@ export function UsersTable() {
         <table className="w-full text-sm">
           <thead className="bg-gray-900 border-b border-gray-800">
             <tr>
-              {['Email', 'Name', 'Role', 'Consent', 'Joined', 'Status'].map((h) => (
+              {['ID', 'Email', 'Name', 'Role', 'Consent', 'Joined', 'Status'].map((h) => (
                 <th
                   key={h}
                   className="text-left px-4 py-2.5 text-xs text-gray-500 font-medium uppercase tracking-wide"
@@ -50,13 +50,13 @@ export function UsersTable() {
           <tbody className="divide-y divide-gray-800">
             {loading ? (
               <tr>
-                <td colSpan={6} className="px-4 py-6 text-center text-gray-500">
+                <td colSpan={7} className="px-4 py-6 text-center text-gray-500">
                   Loading…
                 </td>
               </tr>
             ) : users.length === 0 ? (
               <tr>
-                <td colSpan={6} className="px-4 py-6 text-center text-gray-500">
+                <td colSpan={7} className="px-4 py-6 text-center text-gray-500">
                   No users yet.
                 </td>
               </tr>
@@ -66,6 +66,9 @@ export function UsersTable() {
                   key={u.id}
                   className="hover:bg-gray-900 transition-colors cursor-pointer"
                 >
+                  <td className="px-4 py-2.5 text-gray-500 text-xs font-mono tabular-nums">
+                    {u.id.slice(0, 8)}
+                  </td>
                   <td className="px-4 py-2.5">
                     <Link href={`/users/${u.id}`} className="hover:underline text-indigo-400">
                       {u.email}

docs/adr/0007-egreedy-v1-active-policy.md

@@ -1,7 +1,7 @@
 # ADR-0007: ε-greedy v1 as the active recommendation policy
 
 ## Status
-Accepted — 2026-04-16
+Superseded by ADR-0013 — 2026-05-01
 
 ## Context
 

docs/adr/0012-egreedy-v2-profile-features.md

@@ -1,6 +1,6 @@
 # ADR-0012 — ε-greedy v2: profile features in the bandit (D=7→12)
 
-**Status:** Promoted  
+**Status:** Superseded by ADR-0013 — 2026-05-01
 **Date:** 2026-04-25 (accepted) / 2026-04-26 (promoted)  
 **Issue:** #99