fix(cursor-agent): preserve raw model name for unknown Cursor models

The fallback path in modelDisplayName returned "Auto (Sonnet est.) (est.)"
for any model not listed in modelDisplayNames, double-tagging the est.
suffix and hiding the real model ID. New Cursor model IDs now surface as
their raw name with a single (est.) suffix until the display map is
updated. Adds a regression test.

Author: iamtoruk

src/providers/cursor-agent.ts

@@ -371,9 +371,9 @@ export function createCursorAgentProvider(baseDirOverride?: string): Provider {
     displayName: 'Cursor Agent',
 
     modelDisplayName(model: string): string {
-      const label = modelDisplayNames[model] ?? modelDisplayNames.default
-      if (model === 'default') return label
-      return label.endsWith('(est.)') ? label : `${label} (est.)`
+      if (model === 'default') return modelDisplayNames.default
+      const label = modelDisplayNames[model] ?? model
+      return `${label} (est.)`
     },
 
     toolDisplayName(rawTool: string): string {

tests/providers/cursor-agent.test.ts

@@ -74,6 +74,13 @@ describe('cursor-agent provider', () => {
     expect(provider.modelDisplayName('composer-1')).toBe('Composer 1 (est.)')
   })
 
+  it('falls through to raw model name for unknown models with single est. suffix', () => {
+    const provider = createCursorAgentProvider('/tmp/nonexistent-cursor-agent-fixture')
+
+    expect(provider.modelDisplayName('claude-5-future-model')).toBe('claude-5-future-model (est.)')
+    expect(provider.modelDisplayName('gpt-9')).toBe('gpt-9 (est.)')
+  })
+
   it('returns identity for tool display name', () => {
     const provider = createCursorAgentProvider('/tmp/nonexistent-cursor-agent-fixture')
     expect(provider.toolDisplayName('cursor:edit')).toBe('cursor:edit')