diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9f46fcd8..ecfbd399 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,6 +51,12 @@ jobs:
       - name: Typecheck (tsc --noEmit)
         run: npx nx run-many --target=typecheck --projects=app-web
 
+      # Informe, no puerta: hoy 14 de las 25 historias «usable» no tienen prueba que las nombre,
+      # así que bloquear haría nacer el gate en rojo — y un gate que nace en rojo se ignora. Sí
+      # bloquea si una spec se etiqueta con una historia que el tracker no declara usable (TD-012).
+      - name: Story coverage report (e2e ↔ functional stories)
+        run: npx nx run-many --target=cobertura-historias --projects=app-web
+
       - name: Run Unit Tests
         # `--code-coverage` no es un flag válido de vitest/dotnet (vitest usa `--coverage`).
         # Se corre el target `test` (vitest run); la cobertura se gestiona con test:coverage.
diff --git a/docs/architecture/technical-debt.md b/docs/architecture/technical-debt.md
index 175e9d6c..6de37072 100644
--- a/docs/architecture/technical-debt.md
+++ b/docs/architecture/technical-debt.md
@@ -316,15 +316,36 @@ The write test that caused the 133 is **kept, deliberately, as a sentinel**: it
 
 ---
 
+---
+
 ## [TD-012] Nothing Connects a Functional Story to the Test That Backs It
 
-- **Status**: Confirmed
+- **Status**: **Resolved — measurement in place** (2026-08-10). The gap it measures is real and open.
 - **Severity**: Medium
-- **Component**: `docs/governance/project*/functional-story-gap-tracker.md`, `src/apps/ums.web-app/tests/*.spec.ts`, `docs/architecture/traceability-matrix.md`
-- **Description**: The gap tracker declares **25 stories "Implemented / usable"**. Nothing verifies that claim. There are 23 e2e spec files and **84 cases**, and exactly **one** names a story — `FS-26`, which is not among the 25. The traceability matrix maps FS → ADR → Enabler, never FS → test.
-- **How it surfaced (2026-08-10)**: a verification pass run on request. All 25 stories' REST surfaces answer against a live API, so the backend is not the issue. The issue is that the three defects fixed that same day were **front-end** defects, invisible from the API: `FS-20`/`FS-13` saved `false` for every boolean parameter regardless of the switch, and `FS-05` submitted `undefined` as the user id. Three stories sat green in the tracker while broken.
-- **Measured coverage**: by keyword, `FS-16`, `FS-38` and `FS-39` have **no e2e trace at all**; `FS-09` and `FS-15` have one file each. The rest have de-facto coverage under feature-named specs (`profile-panel`, `role-state`, `parameter-catalog-state`…), but it is inferred from filenames, not declared.
-- **Impact**: the column reads as verification and is intent. Anything hanging off it — a release scorecard, a date commitment, a conversation with product — inherits that gap. And a real regression can sit in a green row indefinitely, which is exactly what happened.
-- **Suggested resolution**: name the story in each e2e case — `test('FS-05 · assign template to profile', …)` — and have CI assert that every story marked usable has at least one passing case. Same shape as the fix in [TD-004](#td-004): it adds no work, and it makes the claim impossible to hold while false.
-- **Related**: the same disease as TD-002, TD-003, TD-010 and G-066 — a document asserting a state nobody checks against the code. This is its last known instance in this repository.
+- **Component**: `docs/governance/project*/functional-story-gap-tracker.md`, `src/apps/ums.web-app/tests/*.spec.ts`
+- **Description**: The tracker declared **25 stories "Implemented / usable"** and nothing verified it. 23 e2e spec files, 84 cases, and exactly one named a story — `FS-26`, not among the 25. The traceability matrix maps FS → ADR → Enabler, never FS → test.
+- **How it surfaced**: three of those 25 were genuinely broken on 2026-08-10 — `FS-20`/`FS-13` saved `false` for every boolean parameter, `FS-05` submitted `undefined` as the user id — and all three sat green here. They were front-end defects, invisible from the API, so a REST sweep would never have found them.
+
+### Resolution
+
+Each spec declares the stories it answers to in its first line (`// @story FS-05, FS-24`), and `scripts/verificar-cobertura-historias.mjs` derives coverage **from the code**, comparing it against the tracker's own table. A separate mapping file was rejected: it would have drifted exactly like everything else this register records.
+
+`npm run cobertura:historias`, wired into CI ahead of the unit tests.
+
+**First measurement — 11 of 25 covered, 14 not:**
+
+| | Stories |
+| :-- | :-- |
+| **Covered** (11) | FS-01, FS-02, FS-03, FS-04, FS-05, FS-13, FS-14, FS-17, FS-20, FS-24, FS-40 |
+| **No e2e naming them** (14) | FS-06, FS-07, FS-08, FS-09, FS-10, FS-11, FS-15, FS-16, FS-18, FS-19, FS-21, FS-22, FS-38, FS-39 |
+
+Three specs answer to no story — `authorization-ui`, `navigation`, `profile-panel` — legitimately: they test UI mechanics, not business outcomes. `profile-panel` is worth naming: the filename sounds like FS-05 and every case is avatar and drawer behaviour. Mapping by filename would have credited FS-05 with coverage it does not have, which is why this was done case by case.
+
+### Why it reports instead of blocking
+
+With 14 of 25 uncovered, a hard gate would be red from birth, and a gate that is red from birth gets ignored. It **does** fail on one condition: a spec tagged with a story the tracker does not declare usable — a labelling error, and a test claiming to cover something unrecognised is worse than no label.
+
+Promoting it to a gate (`--estricto`) is a decision for when the 14 are closed, not before.
+
+- **The underlying gap stays open**: 14 stories are declared usable with nothing exercising them end to end. What changed is that the number is measured on every CI run instead of assumed.
 
diff --git a/src/apps/ums.web-app/package.json b/src/apps/ums.web-app/package.json
index 1a93d982..79f21502 100644
--- a/src/apps/ums.web-app/package.json
+++ b/src/apps/ums.web-app/package.json
@@ -9,6 +9,7 @@
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "typecheck": "tsc --noEmit -p tsconfig.app.json && tsc --noEmit -p tsconfig.node.json",
+    "cobertura:historias": "node scripts/verificar-cobertura-historias.mjs",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
     "test": "vitest run",
diff --git a/src/apps/ums.web-app/project.json b/src/apps/ums.web-app/project.json
index 91bd4aba..faac0d57 100644
--- a/src/apps/ums.web-app/project.json
+++ b/src/apps/ums.web-app/project.json
@@ -20,6 +20,12 @@
       "options": {
         "cwd": "apps/ums.web-app"
       }
+    },
+    "cobertura-historias": {
+      "command": "npm run cobertura:historias",
+      "options": {
+        "cwd": "apps/ums.web-app"
+      }
     }
   }
 }
diff --git a/src/apps/ums.web-app/scripts/verificar-cobertura-historias.mjs b/src/apps/ums.web-app/scripts/verificar-cobertura-historias.mjs
new file mode 100644
index 00000000..3b43c511
--- /dev/null
+++ b/src/apps/ums.web-app/scripts/verificar-cobertura-historias.mjs
@@ -0,0 +1,78 @@
+#!/usr/bin/env node
+/**
+ * verificar-cobertura-historias.mjs — ¿qué historia respalda cada prueba e2e? (TD-012)
+ *
+ * El tracker declara historias «Implemented / usable» y hasta ahora nada lo comprobaba: 84 casos
+ * e2e y uno solo nombraba una historia. Tres historias podían estar rotas —y lo estuvieron el
+ * 2026-08-10— sin que la fila dejara de estar en verde.
+ *
+ * La cobertura se deriva del CÓDIGO, no de un documento aparte: cada spec declara a qué historias
+ * responde con un `// @story FS-NN` en su primera línea. Un fichero de mapeo se habría
+ * desincronizado igual que se desincronizó todo lo demás.
+ *
+ * Salida: informe, no puerta. Hoy 14 de las 25 no tienen cobertura, así que bloquear sería nacer
+ * en rojo — y una puerta que nace en rojo se aprende a ignorar. Se bloquea cuando `--estricto`.
+ */
+import { readFileSync, readdirSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const AQUI = dirname(fileURLToPath(import.meta.url));
+const DIR_PRUEBAS = join(AQUI, '..', 'tests');
+const TRACKER = join(AQUI, '..', '..', '..', '..', 'docs', 'governance', 'project', 'functional-story-gap-tracker.md');
+
+/** Historias que el tracker declara implementadas y usables. */
+function historiasDeclaradasUsables() {
+  const md = readFileSync(TRACKER, 'utf8');
+  // La fila de la TABLA, no la prosa: el propio tracker lleva una nota que cita esa etiqueta
+  // entre comillas, y buscarla por texto suelto engancha el párrafo en vez de los datos.
+  const fila = md.split('\n').find(l => l.startsWith('|') && l.includes('Implemented / usable'));
+  if (!fila) throw new Error('No se encontró la fila «Implemented / usable» en la tabla del tracker.');
+  return [...new Set(fila.match(/FS-\d+/g) ?? [])];
+}
+
+/** Historias que cada spec declara cubrir, leídas del propio fichero. */
+function coberturaDeclaradaEnPruebas() {
+  const porHistoria = new Map();
+  const sinHistoria = [];
+  for (const f of readdirSync(DIR_PRUEBAS).filter(n => n.endsWith('.spec.ts'))) {
+    const primera = readFileSync(join(DIR_PRUEBAS, f), 'utf8').split('\n', 1)[0];
+    const historias = primera.startsWith('// @story') ? (primera.match(/FS-\d+/g) ?? []) : [];
+    if (historias.length === 0) sinHistoria.push(f);
+    for (const h of historias) porHistoria.set(h, [...(porHistoria.get(h) ?? []), f]);
+  }
+  return { porHistoria, sinHistoria };
+}
+
+const usables = historiasDeclaradasUsables();
+const { porHistoria, sinHistoria } = coberturaDeclaradaEnPruebas();
+
+const conCobertura = usables.filter(h => porHistoria.has(h));
+const sinCobertura = usables.filter(h => !porHistoria.has(h));
+
+console.log(`\nHistorias declaradas usables: ${usables.length}`);
+console.log(`  con prueba e2e que las nombra: ${conCobertura.length}`);
+console.log(`  SIN ninguna:                   ${sinCobertura.length}\n`);
+
+for (const h of conCobertura) console.log(`  ✓ ${h}  ${porHistoria.get(h).join(', ')}`);
+if (sinCobertura.length) {
+  console.log('\n  Sin cobertura declarada:');
+  for (const h of sinCobertura) console.log(`  ✗ ${h}`);
+}
+if (sinHistoria.length) {
+  console.log(`\n  Specs sin @story (no responden a ninguna historia): ${sinHistoria.join(', ')}`);
+}
+
+// Una historia etiquetada que el tracker NO declara usable es un error de etiqueta, y ese sí
+// bloquea siempre: significa que una prueba afirma cubrir algo que el tracker no reconoce.
+const desconocidas = [...porHistoria.keys()].filter(h => !usables.includes(h));
+if (desconocidas.length) {
+  console.error(`\nERROR: specs etiquetadas con historias que el tracker no declara usables: ${desconocidas.join(', ')}`);
+  process.exit(1);
+}
+
+if (process.argv.includes('--estricto') && sinCobertura.length) {
+  console.error(`\nERROR (--estricto): ${sinCobertura.length} historias usables sin prueba.`);
+  process.exit(1);
+}
+console.log('');
diff --git a/src/apps/ums.web-app/tests/app-configuration-state.spec.ts b/src/apps/ums.web-app/tests/app-configuration-state.spec.ts
index 3ac3fdb2..ea76b102 100644
--- a/src/apps/ums.web-app/tests/app-configuration-state.spec.ts
+++ b/src/apps/ums.web-app/tests/app-configuration-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-13
 import { test, expect, type Page, type APIResponse } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/auth.spec.ts b/src/apps/ums.web-app/tests/auth.spec.ts
index 5aa36190..877a6c76 100644
--- a/src/apps/ums.web-app/tests/auth.spec.ts
+++ b/src/apps/ums.web-app/tests/auth.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-01
 import { test, expect } from '@playwright/test';
 
 test.describe('Authentication Flow', () => {
diff --git a/src/apps/ums.web-app/tests/business-flows.spec.ts b/src/apps/ums.web-app/tests/business-flows.spec.ts
index a3876076..841aa885 100644
--- a/src/apps/ums.web-app/tests/business-flows.spec.ts
+++ b/src/apps/ums.web-app/tests/business-flows.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-02, FS-14
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/delegation-approval-gate.spec.ts b/src/apps/ums.web-app/tests/delegation-approval-gate.spec.ts
index 449f771f..3c11b291 100644
--- a/src/apps/ums.web-app/tests/delegation-approval-gate.spec.ts
+++ b/src/apps/ums.web-app/tests/delegation-approval-gate.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-14
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/feature-flag-state.spec.ts b/src/apps/ums.web-app/tests/feature-flag-state.spec.ts
index 427f1d2d..71f4ff6a 100644
--- a/src/apps/ums.web-app/tests/feature-flag-state.spec.ts
+++ b/src/apps/ums.web-app/tests/feature-flag-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-40
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/identity-provider.spec.ts b/src/apps/ums.web-app/tests/identity-provider.spec.ts
index f4c63bc1..57590bb2 100644
--- a/src/apps/ums.web-app/tests/identity-provider.spec.ts
+++ b/src/apps/ums.web-app/tests/identity-provider.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-03
 import { test, expect, type Page, type APIResponse } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/login.spec.ts b/src/apps/ums.web-app/tests/login.spec.ts
index 42e741d4..381f620c 100644
--- a/src/apps/ums.web-app/tests/login.spec.ts
+++ b/src/apps/ums.web-app/tests/login.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-01
 import { test, expect } from '@playwright/test';
 
 test.describe('Login Flow', () => {
diff --git a/src/apps/ums.web-app/tests/mvp-creation-chain.spec.ts b/src/apps/ums.web-app/tests/mvp-creation-chain.spec.ts
index eca7279b..0a0efe6b 100644
--- a/src/apps/ums.web-app/tests/mvp-creation-chain.spec.ts
+++ b/src/apps/ums.web-app/tests/mvp-creation-chain.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-02, FS-04
 import { test, expect, Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/mvp-flows.spec.ts b/src/apps/ums.web-app/tests/mvp-flows.spec.ts
index 0a31fbdc..396261bf 100644
--- a/src/apps/ums.web-app/tests/mvp-flows.spec.ts
+++ b/src/apps/ums.web-app/tests/mvp-flows.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-03, FS-04
 import { test, expect } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/parameter-catalog-state.spec.ts b/src/apps/ums.web-app/tests/parameter-catalog-state.spec.ts
index 0a235778..17d5dcf4 100644
--- a/src/apps/ums.web-app/tests/parameter-catalog-state.spec.ts
+++ b/src/apps/ums.web-app/tests/parameter-catalog-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-20
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/parameter-values.spec.ts b/src/apps/ums.web-app/tests/parameter-values.spec.ts
index 787401e6..1f6df345 100644
--- a/src/apps/ums.web-app/tests/parameter-values.spec.ts
+++ b/src/apps/ums.web-app/tests/parameter-values.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-13
 import { test, expect, type Page, type APIResponse } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/permission-template-state.spec.ts b/src/apps/ums.web-app/tests/permission-template-state.spec.ts
index 5cecc9d3..2a900890 100644
--- a/src/apps/ums.web-app/tests/permission-template-state.spec.ts
+++ b/src/apps/ums.web-app/tests/permission-template-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-02
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/profile-slice.spec.ts b/src/apps/ums.web-app/tests/profile-slice.spec.ts
index 4b7fda95..2b718382 100644
--- a/src/apps/ums.web-app/tests/profile-slice.spec.ts
+++ b/src/apps/ums.web-app/tests/profile-slice.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-05
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/profile-state.spec.ts b/src/apps/ums.web-app/tests/profile-state.spec.ts
index 91b63a11..0331ea2e 100644
--- a/src/apps/ums.web-app/tests/profile-state.spec.ts
+++ b/src/apps/ums.web-app/tests/profile-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-05, FS-24, FS-40
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/role-state.spec.ts b/src/apps/ums.web-app/tests/role-state.spec.ts
index 06c179ea..a63ec6f2 100644
--- a/src/apps/ums.web-app/tests/role-state.spec.ts
+++ b/src/apps/ums.web-app/tests/role-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-17, FS-40
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/system-suite-actions.spec.ts b/src/apps/ums.web-app/tests/system-suite-actions.spec.ts
index 4ff24891..b080b188 100644
--- a/src/apps/ums.web-app/tests/system-suite-actions.spec.ts
+++ b/src/apps/ums.web-app/tests/system-suite-actions.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-04, FS-40
 import { test, expect, type Page, type Locator } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/system-suite-modules.spec.ts b/src/apps/ums.web-app/tests/system-suite-modules.spec.ts
index 34094f0a..e05f7e27 100644
--- a/src/apps/ums.web-app/tests/system-suite-modules.spec.ts
+++ b/src/apps/ums.web-app/tests/system-suite-modules.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-04
 import { test, expect, type Page, type Locator } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/system-suite-state.spec.ts b/src/apps/ums.web-app/tests/system-suite-state.spec.ts
index 4aaa2473..2fdb90d6 100644
--- a/src/apps/ums.web-app/tests/system-suite-state.spec.ts
+++ b/src/apps/ums.web-app/tests/system-suite-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-04
 import { test, expect, type Page } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/tenant-state-toggle.spec.ts b/src/apps/ums.web-app/tests/tenant-state-toggle.spec.ts
index e6a47591..df2e9387 100644
--- a/src/apps/ums.web-app/tests/tenant-state-toggle.spec.ts
+++ b/src/apps/ums.web-app/tests/tenant-state-toggle.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-03, FS-40
 import { test, expect } from '@playwright/test';
 
 /**
diff --git a/src/apps/ums.web-app/tests/user-account-state.spec.ts b/src/apps/ums.web-app/tests/user-account-state.spec.ts
index fe488b01..a0c53d4f 100644
--- a/src/apps/ums.web-app/tests/user-account-state.spec.ts
+++ b/src/apps/ums.web-app/tests/user-account-state.spec.ts
@@ -1,3 +1,4 @@
+// @story FS-40
 import { test, expect, type Page } from '@playwright/test';
 import { borrarResiduo } from './helpers/limpieza';