feat(tools): issue_get, release_create, repo_delete (#11, #17, #20)

issue_get: GET /repos/{owner}/{repo}/issues/{number} — full issue with labels, assignees, comment count
release_create: POST /repos/{owner}/{repo}/releases — create release and tag in one call
repo_delete: DELETE /repos/{owner}/{repo} — confirm=<repo name> required, blocks accidents

internal/gitea/repos_test.go

@@ -136,6 +136,40 @@ func TestUpdateTopics(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestCreateRelease(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+		assert.Equal(t, "/api/v1/repos/mathias/infra/releases", r.URL.Path)
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusCreated)
+		_, _ = w.Write([]byte(`{"id":1,"tag_name":"v1.0.0","name":"v1.0.0","body":"first release","draft":false,"prerelease":false,"html_url":"https://gitea.example.com/mathias/infra/releases/tag/v1.0.0","created_at":"2026-05-15T00:00:00Z"}`))
+	}))
+	defer srv.Close()
+
+	c := gitea.NewClient(srv.URL, "tok")
+	rel, err := c.CreateRelease(context.Background(), "mathias", "infra", gitea.CreateReleaseArgs{
+		TagName: "v1.0.0",
+		Name:    "v1.0.0",
+		Body:    "first release",
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "v1.0.0", rel.TagName)
+	assert.Equal(t, "first release", rel.Body)
+}
+
+func TestDeleteRepo(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodDelete, r.Method)
+		assert.Equal(t, "/api/v1/repos/mathias/infra", r.URL.Path)
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	c := gitea.NewClient(srv.URL, "tok")
+	err := c.DeleteRepo(context.Background(), "mathias", "infra")
+	require.NoError(t, err)
+}
+
 func TestDefaultBranchCachesAcrossCalls(t *testing.T) {
 	var hits int32
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {