v2.2-paseo-providers: Paseo provider stack + v2.2.1 pane-scoped chat fixes

Ship Paseo-equivalent provider snapshot, AgentComposerBar, ACP dispatch
rewrite with streaming/persist, permission prompts, and agent commands.
Follow-up: pane-scoped chat resolution, CoderMessageList tool timeline,
WS user-delta replace, and inference orphan tool_call stripping.
Archive openspec v2-2; update CHANGELOG and CURRENT.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/components/AgentCommandsHint.tsx

@@ -0,0 +1,39 @@
+import { ChevronDown } from 'lucide-react';
+import { useState } from 'react';
+import type { AgentCommand } from '@/api/types';
+import { cn } from '@/lib/utils';
+
+interface Props {
+  commands: AgentCommand[];
+}
+
+export function AgentCommandsHint({ commands }: Props) {
+  const [open, setOpen] = useState(false);
+
+  if (commands.length === 0) return null;
+
+  return (
+    <div className="mx-2 mb-1 rounded-md border border-border/60 bg-muted/30 text-xs">
+      <button
+        type="button"
+        onClick={() => setOpen((v) => !v)}
+        className="w-full flex items-center justify-between px-2 py-1.5 text-muted-foreground hover:text-foreground max-md:min-h-[44px]"
+      >
+        <span>Slash commands ({commands.length})</span>
+        <ChevronDown className={cn('size-3.5 transition-transform', open && 'rotate-180')} />
+      </button>
+      {open && (
+        <ul className="px-2 pb-2 space-y-1 border-t border-border/40 max-h-48 overflow-y-auto overscroll-contain touch-pan-y">
+          {commands.map((cmd) => (
+            <li key={cmd.name} className="font-mono">
+              <span className="text-primary/80">/{cmd.name}</span>
+              {cmd.description && (
+                <span className="ml-1.5 text-muted-foreground font-sans line-clamp-1">{cmd.description}</span>
+              )}
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+}