feat(F-001): scaffold modular monolith skeleton with boundary checker

- TypeScript + Fastify skeleton under project/ (src/modules, shared, infrastructure, app)
- scripts/check-module-boundaries.mjs enforcing module public-API rules (tested with fixtures)
- GET /health endpoint, error envelope without stack leakage
- specs/F-001-scaffold (SPEC/DESIGN/TASKS/TESTS), spec/tech.md dependency justification
- 30-ticket MercadoDeVida roadmap in backlog/features.json, spec/roadmap.md
- All gates approved: reviewer, security, qa; verify.sh green

project/scripts/tests/fixtures/cross-module-internal/modules/alpha/api/routes.ts

@@ -0,0 +1,2 @@
+import { secret } from '../../beta/domain/secret.js';
+export const routes = [secret];

project/scripts/tests/fixtures/cross-module-internal/modules/beta/domain/secret.ts

@@ -0,0 +1 @@
+export const secret = 'secret';

project/scripts/tests/fixtures/deep-from-app/app/main.ts

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+import { routes } from '../modules/alpha/api/routes.js';
+export const main = [routes];

project/scripts/tests/fixtures/deep-from-app/modules/alpha/api/routes.ts

@@ -0,0 +1 @@
+export const routes = 'routes';

project/scripts/tests/fixtures/ok/app/main.ts

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+import { alpha } from '../modules/alpha/index.js';
+import { beta } from '../modules/beta/index.js';
+export const main = [alpha, beta];

project/scripts/tests/fixtures/ok/modules/alpha/api/routes.ts

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+import { alpha } from '../index.js';
+import { sharedUtil } from '../../../shared/util.js';
+export const routes = [alpha, sharedUtil];

project/scripts/tests/fixtures/ok/modules/alpha/index.ts

@@ -0,0 +1 @@
+export const alpha = 'alpha';

project/scripts/tests/fixtures/ok/modules/beta/index.ts

@@ -0,0 +1 @@
+export const beta = 'beta';

project/scripts/tests/fixtures/ok/shared/util.ts

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+export const sharedUtil = 'shared';