docs(10-01): complete admin SPA tracer plan

.planning/phases/10-admin-vue-spa/deferred-items.md

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+# Phase 10 deferred items
+
+Out-of-scope issues found while executing Phase 10 plans. They are not caused by
+Phase 10 changes and are not fixed here.
+
+## From 10-01
+
+- **fonoteka.go `parity` package fails two tests before Phase 10.**
+  `TestMigrateSeedsCanonicalGenres` expects no `summer_migrations_summercms_cabana`
+  history table, and `TestSchemaMatchesPHPSnapshot` reports `backend_users`,
+  `backend_user_roles` and `backend_jwt_blacklist` as unexpected extra tables.
+  All four come from the Phase 9 cabana migrations. Reproduced on untouched copies
+  of both repositories at the pre-10-01 commits (summercms.go `8c3e131`,
+  fonoteka.go `feaca6b`), so `go test ./...` in fonoteka.go was already red in
+  this package. Fix belongs to a Phase 9 follow-up: add the cabana history table
+  and the three backend tables to the parity allow-lists with a reason.
+- **`gofmt -l` lists `internal/build/registry.go`** in summercms.go. Pre-existing,
+  untouched by Phase 10.