chore: add changeset for bulk-write hardening (#3147–#3152)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01APnSDJneEDRh3Z51KGCLga

Author: claude

.changeset/bulk-write-hardening.md

@@ -0,0 +1,31 @@
+---
+"@objectstack/core": patch
+"@objectstack/objectql": patch
+"@objectstack/rest": patch
+"@objectstack/metadata-protocol": patch
+---
+
+fix: harden the bulk-write path — retries, idempotency, contracts, and summary visibility (#3147–#3152)
+
+Six reliability fixes to the batched seed/import + `engine.insert(array)` path
+introduced by the #2678 bulk-write rework:
+
+- **#3151** `bulkWrite` validates that `writeBatch` returns one record per input
+  row (a short/long/non-array return is degraded per-row, not backfilled as
+  phantom success); `engine.insert(array)` likewise rejects a short driver
+  `bulkCreate` return instead of padding afterInsert with `undefined`.
+- **#3150** wraps the two remaining un-retried write points (seed
+  `writeRecord`/`resolveDeferredUpdates`, import's no-`createManyData`
+  fallback) in `withTransientRetry`; `defaultIsTransientError` short-circuits
+  definitive logical errors to non-transient.
+- **#3148** import `resolveRef` flushes pending creates on a same-object miss so
+  a later row can reference an earlier same-file CREATE, and no longer
+  negatively caches a miss.
+- **#3149** threads an `attempt` counter through `bulkWrite`; seed rechecks by
+  `externalId` and import by `matchFields` before re-writing, so a
+  commit-then-lost-response retry cannot duplicate a batch.
+- **#3147** `recomputeSummaries` retries transient failures and, on exhaustion,
+  surfaces `SummaryRecomputeError` (`ERR_SUMMARY_RECOMPUTE`) instead of a
+  silent warn; seed/import recover it to a warning without re-writing.
+- **#3152** autonumbers are assigned after validation, so a batch that dies in
+  validation consumes no sequence value (no number-range gaps).