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/coder/src/services/cursor-models.ts

@@ -0,0 +1,39 @@
+/**
+ * Cursor model list parser — lifted from Paseo cursor-acp-agent.ts
+ */
+import type { ProviderModel } from './provider-types.js';
+
+const CURSOR_MODEL_MARKER_PATTERN = /\s+\((?:default|current)\)$/;
+
+export function parseCursorAgentModelsOutput(output: string): ProviderModel[] {
+  const parsed = output
+    .split(/\r?\n/)
+    .map((line) => line.trim())
+    .filter((line) => line && line !== 'Available models' && !line.startsWith('Tip:'))
+    .map((line) => {
+      const separatorIndex = line.indexOf(' - ');
+      if (separatorIndex <= 0) return null;
+
+      const id = line.slice(0, separatorIndex).trim();
+      const rawLabel = line.slice(separatorIndex + 3).trim();
+      if (!id || !rawLabel) return null;
+
+      let marker: 'default' | 'current' | null = null;
+      if (rawLabel.endsWith(' (default)')) marker = 'default';
+      else if (rawLabel.endsWith(' (current)')) marker = 'current';
+
+      return { id, label: rawLabel.replace(CURSOR_MODEL_MARKER_PATTERN, ''), marker };
+    })
+    .filter((m): m is { id: string; label: string; marker: 'default' | 'current' | null } => m !== null);
+
+  const defaultModelId =
+    parsed.find((m) => m.marker === 'default')?.id ??
+    parsed.find((m) => m.marker === 'current')?.id ??
+    parsed[0]?.id;
+
+  return parsed.map((model) => ({
+    id: model.id,
+    label: model.label,
+    isDefault: model.id === defaultModelId,
+  }));
+}