feat(profiles): expose codex runtime across surfaces

- update CLI, API, route, and dashboard surfaces to recognize the Codex runtime target

- normalize persisted codex targets back to claude so runtime-only behavior stays truthful

- add regression coverage for help text, route parsing, and profile storage normalization

Refs #773

tests/unit/web-server/target-parse-routes.test.ts

@@ -13,8 +13,10 @@ describe('route target parsing', () => {
 
   it('returns null for invalid target values', () => {
     expect(parseProfileTarget('glm')).toBeNull();
+    expect(parseProfileTarget('codex')).toBeNull();
     expect(parseProfileTarget('')).toBeNull();
     expect(parseVariantTarget('factory')).toBeNull();
+    expect(parseVariantTarget('codex')).toBeNull();
     expect(parseVariantTarget('  ')).toBeNull();
   });