diff --git a/docs/plans/prewarm-rotas-home-search-mudar-tendencia-impl.md b/docs/plans/prewarm-rotas-home-search-mudar-tendencia-impl.md
index ea9886f2..432f5e40 100644
--- a/docs/plans/prewarm-rotas-home-search-mudar-tendencia-impl.md
+++ b/docs/plans/prewarm-rotas-home-search-mudar-tendencia-impl.md
@@ -64,8 +64,20 @@ webServer `waitOn` prewarm
 - Medição sob load ≥40 é cara: mitigação — verificação local direcionada
   (workers ≥2, setup primeiro), sem CI novo.
 
+## Desvio da intenção (aprovado 2026-08-11)
+
+A intenção dizia "sem mudança de asserções ou de CI", mas o gate:ci falhou com
+"No tests found" — **falha pré-existente do classificador** (OPS39 é a primeira
+PR setup-only): o `setup` só existe em dev mode (projeto dropado sob `CI=1`,
+playwright.config.ts OPS34), e `selectE2eSpecs` o selecionava sozinho para o
+e2e prod-mode. Fix no dono (`scripts/lib/test-affected-core.mjs`): seleção
+contendo **apenas** `setup` → `mode: 'none'` (spec dev-only; sets mistos seguem
+inalterados — o spec simplesmente não casa projeto). 2 testes de unidade novos
+em `tests/unit/testAffected.unit.spec.ts`.
+
 ## Aceite de engenharia
 
 - [x] Aceite de produto da intenção ainda coberto
 - [x] Invariantes AGENTS/engineering-standards (nenhum código runtime tocado)
-- [x] Testes de domínio previstos (unit/int): não se aplica — mudança só em spec e2e
+- [x] Testes de domínio previstos (unit/int): 2 unit novos no classificador
+  (`testAffected.unit.spec.ts`); runtime intocado
diff --git a/scripts/lib/test-affected-core.mjs b/scripts/lib/test-affected-core.mjs
index de841b63..c02383a3 100644
--- a/scripts/lib/test-affected-core.mjs
+++ b/scripts/lib/test-affected-core.mjs
@@ -232,6 +232,20 @@ export function selectE2eSpecs(files, manifest) {
       unmapped,
     }
   }
+  // The `setup` spec is dev-mode-only: the setup project is dropped under
+  // CI/prod (playwright.config.ts), so a selection containing ONLY it would
+  // run `playwright test -- tests/e2e/setup.e2e.spec.ts` against zero projects
+  // and fail with "No tests found" (OPS39 — first setup-only PR hit it). In a
+  // mixed set the spec is harmless (it just matches no project), so only the
+  // setup-only case drops out.
+  if (specs.size === 1 && specs.has('setup')) {
+    return {
+      mode: 'none',
+      specs: [],
+      reason: 'setup spec is dev-mode-only; prod-mode e2e cannot run it',
+      unmapped,
+    }
+  }
   return {
     mode: 'selected',
     specs: [...specs].sort(),
diff --git a/tests/unit/testAffected.unit.spec.ts b/tests/unit/testAffected.unit.spec.ts
index 4a899969..b5a88abb 100644
--- a/tests/unit/testAffected.unit.spec.ts
+++ b/tests/unit/testAffected.unit.spec.ts
@@ -136,6 +136,22 @@ describe('selectE2eSpecs (OPS5)', () => {
     const result = selectE2eSpecs([changed('docs/AGENT-OPS.md')], manifest)
     expect(result).toMatchObject({ mode: 'none', specs: [], unmapped: [] })
   })
+
+  it('drops a setup-only selection (setup runs only in dev mode, OPS39)', () => {
+    const result = selectE2eSpecs([changed('tests/e2e/setup.e2e.spec.ts')], manifest)
+    expect(result).toMatchObject({ mode: 'none', specs: [], unmapped: [] })
+    expect(result.reason).toContain('dev-mode-only')
+  })
+
+  it('keeps setup in a mixed selection (it matches no project, harmless)', () => {
+    const result = selectE2eSpecs(
+      [changed('tests/e2e/setup.e2e.spec.ts'), changed('src/app/(payload)/api/x.ts')],
+      manifest,
+    )
+    expect(result.mode).toBe('selected')
+    expect(result.specs).toContain('setup')
+    expect(result.specs).toContain('admin')
+  })
 })
 
 describe('e2eShardConfig (OPS34)', () => {