fix(cli): improve cliproxy target parsing edge cases

- support POSIX -- terminator so dash-prefixed variant names remain positional

- export variant parser for direct unit tests

- add --target parsing coverage for API and cliproxy arg parsers

tests/unit/commands/api-command-args.test.ts

@@ -44,10 +44,40 @@ describe('api-command arg parser', () => {
     expect(parsed.errors).toEqual([]);
   });
 
+  test('parses --target=value for default profile target', () => {
+    const parsed = parseApiCommandArgs(['my-api', '--target=droid']);
+
+    expect(parsed.name).toBe('my-api');
+    expect(parsed.target).toBe('droid');
+    expect(parsed.errors).toEqual([]);
+  });
+
   test('validates invalid --target values', () => {
     const parsed = parseApiCommandArgs(['my-api', '--target', 'invalid-target']);
 
     expect(parsed.target).toBeUndefined();
     expect(parsed.errors).toEqual(['Invalid --target value "invalid-target". Use: claude or droid']);
   });
+
+  test('collects missing-value error for --target with no value', () => {
+    const parsed = parseApiCommandArgs(['my-api', '--target']);
+
+    expect(parsed.target).toBeUndefined();
+    expect(parsed.errors).toEqual(['Missing value for --target']);
+  });
+
+  test('treats empty --target=value as missing value', () => {
+    const parsed = parseApiCommandArgs(['my-api', '--target=']);
+
+    expect(parsed.target).toBeUndefined();
+    expect(parsed.errors).toEqual(['Missing value for --target']);
+  });
+
+  test('uses last --target value when repeated', () => {
+    const parsed = parseApiCommandArgs(['my-api', '--target', 'claude', '--target=droid']);
+
+    expect(parsed.name).toBe('my-api');
+    expect(parsed.target).toBe('droid');
+    expect(parsed.errors).toEqual([]);
+  });
 });