feat(OPS97): disableAutoMerge no github-api + auto_merge normalizado (tests unit)

scripts/lib/github-api.mjs

@@ -175,6 +175,9 @@ export const createApi = ({
     merged: Boolean(pr.merged_at || pr.merged),
     draft: Boolean(pr.draft),
     mergeable: pr.mergeable ?? null,
+    autoMerge: pr.auto_merge
+      ? { mergeMethod: pr.auto_merge.merge_method ?? '', enabledBy: pr.auto_merge.enabled_by?.login ?? '' }
+      : null,
     nodeId: pr.node_id ?? '',
     head: { ref: pr.head?.ref ?? '', sha: pr.head?.sha ?? '' },
     base: { ref: pr.base?.ref ?? '' },
@@ -386,6 +389,23 @@ export const createApi = ({
       )
     },
 
+    /**
+     * DELETE /pulls/{number}/auto-merge — disarms GitHub's native auto-merge.
+     * Tolerates 404 (nothing armed) — idempotent by contract; any other error
+     * rethrows. The react-audit skill calls this right after opening its PR
+     * and after every subsequent push (the safety net workflow re-arms on
+     * each `synchronize`).
+     */
+    disableAutoMerge: async (number) => {
+      try {
+        await request(`/repos/${owner}/${name}/pulls/${number}/auto-merge`, {
+          method: 'DELETE',
+        })
+      } catch (error) {
+        if (!/\b404\b/.test(String(error?.message ?? ''))) throw error
+      }
+    },
+
     /**
      * GET /repos/{owner}/{repo}/branches/{branch}/protection — normalized for
      * drift comparison; `null` when the branch has no protection rule (404).

tests/unit/githubApi.unit.spec.ts

@@ -132,4 +132,45 @@ describe('github-api (issue tracker layer)', () => {
     expect(file?.content).toBe('olá mundo')
     expect(file?.sha).toBe('s')
   })
+
+  it('getPullRequest normalizes auto_merge into autoMerge', async () => {
+    const api = createApi({
+      token: 'tok',
+      fetchImpl: async () =>
+        ok({ number: 5, state: 'open', draft: false, auto_merge: { merge_method: 'rebase' } }),
+    })
+    const pr = await api.getPullRequest(5)
+    expect(pr?.autoMerge?.mergeMethod).toBe('rebase')
+    expect(pr?.head).toEqual({ ref: '', sha: '' })
+  })
+
+  it('disableAutoMerge DELETEs the auto-merge endpoint', async () => {
+    const calls: FetchCall[] = []
+    const api = createApi({
+      token: 'tok',
+      fetchImpl: async (url, init) => {
+        calls.push({ url: String(url), init })
+        return ok({})
+      },
+    })
+    await api.disableAutoMerge(7)
+    expect(calls[0].url).toContain('/repos/fsolla/teqo/pulls/7/auto-merge')
+    expect(calls[0].init?.method).toBe('DELETE')
+  })
+
+  it('disableAutoMerge tolerates 404 when nothing is armed', async () => {
+    const api = createApi({
+      token: 'tok',
+      fetchImpl: async () => ok({ message: 'Auto-merge request is disabled for this pull request' }, 404),
+    })
+    await expect(api.disableAutoMerge(9)).resolves.toBeUndefined()
+  })
+
+  it('disableAutoMerge rethrows non-404 errors', async () => {
+    const api = createApi({
+      token: 'tok',
+      fetchImpl: async () => ok({ message: 'nope' }, 422),
+    })
+    await expect(api.disableAutoMerge(11)).rejects.toThrow(/422/)
+  })
 })