test(health): pin F4 phase metadata

Alinea el preflight real del auto-deploy VPS con la barrera Docker de GitHub CI, montando contratos cross-tree en read-only y agregando una guardia de paridad.

api-v3/src/version.ts

@@ -1,2 +1,2 @@
 export const API_VERSION = '0.25.0-1';
-export const API_PHASE = 'F3.2';
+export const API_PHASE = 'F4';

api-v3/test/unit/f4-health-metadata.test.ts

@@ -0,0 +1,8 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { API_PHASE, API_VERSION } from '../../src/version';
+
+test('F4 health metadata reports the deployed phase without changing the release version', () => {
+  assert.equal(API_PHASE, 'F4');
+  assert.equal(API_VERSION, '0.25.0-1');
+});