test: replace legacy workspace deployment fixtures

scripts/test-no-deployment-coupling-scope.sh

@@ -9,7 +9,6 @@ trap 'rm -rf "$fixture"' EXIT HUP INT TERM
 new_fixture() {
   rm -rf "$fixture/repository"
   mkdir -p \
-    "$fixture/repository/backend/src/workspaces" \
     "$fixture/repository/deploy/env" \
     "$fixture/repository/deploy/workspaces" \
     "$fixture/repository/docker/smoke" \
@@ -26,8 +25,6 @@ new_fixture() {
   printf '%s\n' 'THT_LLM_URL=https://llm.example.invalid' >"$fixture/repository/deploy/env/local.env.example"
   printf '%s\n' '# generic launcher' >"$fixture/repository/scripts/run-stack.sh"
   printf '%s\n' '// generic frontend configuration' >"$fixture/repository/frontend/vite.config.ts"
-  printf '%s\n' '// explicit descriptor migration module may mention pgvector during conversion' \
-    >"$fixture/repository/backend/src/workspaces/migrate-legacy.ts"
   printf '%s\n' 'language: en' 'vectors: { type: qdrant, base_url: http://qdrant:6333, collection: demo }' \
     >"$fixture/repository/deploy/workspaces/example.yaml"
   printf '%s\n' '# qdrant backup helper' >"$fixture/repository/scripts/vector-backup.sh"