fix(droid): avoid interactive model arg prompt pollution

- persist selector in ~/.factory/settings.json as settings.model

- stop injecting '-m custom:...' for interactive droid launches

- improve provider inference for localhost /v1 and qwen/deepseek/kimi

- add regression tests for adapter, provider, and config manager

tests/unit/targets/droid-adapter.test.ts

@@ -5,9 +5,9 @@ import { describe, it, expect } from 'bun:test';
 import { DroidAdapter } from '../../../src/targets/droid-adapter';
 
 describe('DroidAdapter.buildArgs', () => {
-  it('builds droid model args for valid profile names', () => {
+  it('passes user args without model injection for valid profile names', () => {
     const adapter = new DroidAdapter();
-    expect(adapter.buildArgs('gemini_01', ['--help'])).toEqual(['-m', 'custom:ccs-gemini_01', '--help']);
+    expect(adapter.buildArgs('gemini_01', ['--help'])).toEqual(['--help']);
   });
 
   it('rejects unsafe profile names', () => {

tests/unit/targets/droid-config-manager.test.ts

@@ -45,6 +45,10 @@ describe('droid-config-manager', () => {
       expect(ref.selectorAlias).toBe('CCS-gemini-0');
       expect(ref.selector).toBe('custom:CCS-gemini-0');
       expect(ref.index).toBe(0);
+
+      const settingsPath = path.join(tmpDir, '.factory', 'settings.json');
+      const settings = JSON.parse(fs.readFileSync(settingsPath, 'utf8'));
+      expect(settings.model).toBe('custom:CCS-gemini-0');
     });
 
     it('should create settings.json with customModels', async () => {
@@ -63,6 +67,7 @@ describe('droid-config-manager', () => {
       expect(settings.customModels).toHaveLength(1);
       expect(settings.customModels[0].displayName).toBe('CCS gemini');
       expect(settings.customModels[0].baseUrl).toBe('http://localhost:8317');
+      expect(settings.model).toBe('custom:CCS-gemini-0');
     });
 
     it('should update existing entry on second upsert', async () => {

tests/unit/targets/droid-provider.test.ts

@@ -46,6 +46,18 @@ describe('droid-provider', () => {
         'generic-chat-completion-api'
       );
     });
+
+    it('detects localhost openai-compatible /v1 endpoints', () => {
+      expect(inferDroidProviderFromBaseUrl('http://127.0.0.1:1234/v1')).toBe(
+        'generic-chat-completion-api'
+      );
+      expect(inferDroidProviderFromBaseUrl('http://localhost:8317/v1/chat/completions')).toBe(
+        'generic-chat-completion-api'
+      );
+      expect(inferDroidProviderFromBaseUrl('http://[::1]:8317/v1')).toBe(
+        'generic-chat-completion-api'
+      );
+    });
   });
 
   describe('inferDroidProviderFromModel', () => {
@@ -56,6 +68,12 @@ describe('droid-provider', () => {
     it('detects openai model naming', () => {
       expect(inferDroidProviderFromModel('gpt-5-codex')).toBe('openai');
     });
+
+    it('detects generic openai-compatible model families', () => {
+      expect(inferDroidProviderFromModel('qwen3-coder-plus')).toBe('generic-chat-completion-api');
+      expect(inferDroidProviderFromModel('deepseek-v3.1')).toBe('generic-chat-completion-api');
+      expect(inferDroidProviderFromModel('kimi-k2')).toBe('generic-chat-completion-api');
+    });
   });
 
   describe('resolveDroidProvider', () => {

tests/unit/targets/target-registry.test.ts

@@ -125,10 +125,16 @@ describe('DroidAdapter', () => {
     expect(adapter.supportsProfileType('copilot')).toBe(false);
   });
 
-  it('should build args with -m custom:ccs- prefix', () => {
+  it('should keep interactive args clean (no model argv injection)', () => {
     const isolatedAdapter = new DroidAdapter();
     const args = isolatedAdapter.buildArgs('gemini', ['--verbose']);
-    expect(args).toEqual(['-m', 'custom:ccs-gemini', '--verbose']);
+    expect(args).toEqual(['--verbose']);
+  });
+
+  it('should not queue model selector as prompt when no user args', () => {
+    const isolatedAdapter = new DroidAdapter();
+    const args = isolatedAdapter.buildArgs('codex', []);
+    expect(args).toEqual([]);
   });
 
   it('should build minimal env (no ANTHROPIC_ vars)', () => {
@@ -200,7 +206,7 @@ describe('DroidAdapter', () => {
       });
 
       const args = isolatedAdapter.buildArgs('gemini', ['--verbose']);
-      expect(args).toEqual(['-m', 'custom:CCS-gemini-0', '--verbose']);
+      expect(args).toEqual(['--verbose']);
     } finally {
       if (originalCcsHome !== undefined) process.env.CCS_HOME = originalCcsHome;
       else delete process.env.CCS_HOME;