mobile: fix flex-row text overflow; parallelize door-ingest poll; docs refresh

Mobile responsiveness: several flex rows had a `truncate` child without
`min-w-0`, so a long value (member/door name, channel name, published form
URL) would not shrink and pushed the row past the viewport on a phone. Added
`min-w-0` (with `flex-1`/`shrink-0` where needed) on the dashboard presence +
door-self-entry rows, the comms channel list, and the form-builder URL.

Door inbound poll: `/api/cron/door-ingest` now polls connections with
Promise.allSettled instead of a sequential loop, so one tick is bounded to the
slowest single poll rather than the sum of all per-call timeouts; each
connection stays isolated and the run is idempotent.

Docs: refreshed ARCHITECTURE (door epic marked complete P1-P5), the README
access-control feature bullet + project-status pointer, a historical banner on
the older AUDIT.md, a door-epic CHANGELOG entry, and the rolling HANDOFF audit
log (passes 65-68). No migration; no behavior change for existing users.

app/(app)/dashboard/door-self-entry.tsx

@@ -31,8 +31,8 @@ export function DoorSelfEntry({ doors }: { doors: Door[] }) {
     <div className="bg-card rounded border border-border divide-y divide-border">
       {doors.map(d => (
         <div key={d.id} className="flex items-center justify-between gap-3 px-4 py-3">
-          <span className="font-sans text-sm text-foreground truncate">{d.name}</span>
-          <Button size="sm" disabled={busy === d.id} onClick={() => open(d)}>
+          <span className="flex-1 min-w-0 font-sans text-sm text-foreground truncate">{d.name}</span>
+          <Button size="sm" className="shrink-0" disabled={busy === d.id} onClick={() => open(d)}>
             {busy === d.id ? 'Opening…' : 'Open'}
           </Button>
         </div>

app/(app)/dashboard/presence-panel.tsx

@@ -65,7 +65,7 @@ export function PresencePanel({ present }: { present: Present[] }) {
           <ul className="divide-y divide-border">
             {present.map(p => (
               <li key={p.id} className="flex items-center justify-between gap-3 px-4 py-2.5">
-                <span className="font-sans text-sm text-foreground truncate">
+                <span className="flex-1 min-w-0 font-sans text-sm text-foreground truncate">
                   {p.name}{p.isMe ? ' (you)' : ''}
                   {p.note && <span className="font-mono text-[10px] text-muted-foreground ml-2">{p.note}</span>}
                 </span>