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/__tests__/cursor-models.test.ts

@@ -0,0 +1,47 @@
+import { describe, it, expect } from 'vitest';
+import { parseCursorAgentModelsOutput } from '../cursor-models.js';
+
+describe('parseCursorAgentModelsOutput', () => {
+  it('parses cursor-agent models output with default marker', () => {
+    const output = `
+Available models
+claude-4-sonnet - Claude 4 Sonnet (default)
+gpt-4.1 - GPT-4.1
+Tip: use cursor-agent models for full list
+`.trim();
+
+    const models = parseCursorAgentModelsOutput(output);
+
+    expect(models).toEqual([
+      { id: 'claude-4-sonnet', label: 'Claude 4 Sonnet', isDefault: true },
+      { id: 'gpt-4.1', label: 'GPT-4.1', isDefault: false },
+    ]);
+  });
+
+  it('uses current marker when no default', () => {
+    const output = `
+model-a - Model A (current)
+model-b - Model B
+`.trim();
+
+    const models = parseCursorAgentModelsOutput(output);
+
+    expect(models.find((m) => m.id === 'model-a')?.isDefault).toBe(true);
+    expect(models.find((m) => m.id === 'model-b')?.isDefault).toBe(false);
+  });
+
+  it('defaults to first model when no markers', () => {
+    const output = 'alpha - Alpha\nbeta - Beta';
+    const models = parseCursorAgentModelsOutput(output);
+
+    expect(models[0]?.isDefault).toBe(true);
+    expect(models[1]?.isDefault).toBe(false);
+  });
+
+  it('skips malformed lines', () => {
+    const output = 'no-separator\nvalid - Valid';
+    const models = parseCursorAgentModelsOutput(output);
+
+    expect(models).toEqual([{ id: 'valid', label: 'Valid', isDefault: true }]);
+  });
+});