fix(test): point container_rendermode_test at the v2 BSON driver

.claude/skills/fix-issue/findings/other/2026-10-20-concurrent-merge-reintroduced-v1-driver.json

@@ -0,0 +1 @@
+{"area": "mdl/backend/pagemutator", "date": "2026-10-20", "symptom": "main went red immediately after ako/mxcli#1497 (the v1 BSON driver removal) merged: `mdl/backend/pagemutator/container_rendermode_test.go:8:2: no required module provides package go.mongodb.org/mongo-driver/bson`, the package failing [setup failed], plus `--- FAIL: TestNoV1DriverImports ... imported again by 1 file(s)`", "cause": "Not a defect in either PR. ako/mxcli#1498 was authored and tested against a main that still required the v1 driver, and merged just before #1497 removed it. Neither PR conflicted with the other — different files — so nothing flagged the combination, and each was green on its own base. The file uses bson.D only, so the fix is the import path alone", "file": "`mdl/backend/pagemutator/container_rendermode_test.go` — v1 bson import -> v2", "insight": "Removing a module the whole repo imports is not finished when the PR is green: any PR already open at that moment is still written against the old module, and a merge of two non-conflicting PRs can break main where neither breaks it alone. This happened TWICE in one change — first caught in-branch when merging origin/main pulled in #1495's 7 new v1 imports, then again post-merge from #1498 — so expect it rather than being surprised. TestNoV1DriverImports is what names the file both times, and its value is exactly here: a re-added import is not a build error while the module is still required, and after removal the compile error names only the package, not the reason. The structural fix is a repo setting, not code: require branches to be up to date before merging, for the window around any dependency removal. When it does happen, check the whole tree (`grep -rn '\"go.mongodb.org/mongo-driver/bson'`) rather than only the file CI named — CI stops at the first [setup failed] package and a second offender would surface only on the next run", "refs": ["ako/mxcli#1497", "ako/mxcli#1498", "ako/mxcli#1495"]}

mdl/backend/pagemutator/container_rendermode_test.go

@@ -5,7 +5,7 @@ package pagemutator
 import (
 	"testing"
 
-	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/v2/bson"
 
 	"github.com/mendixlabs/mxcli/mdl/backend/bsonnav"
 )