Workflow-side soft-ref sync — the `coreWorkflowId` mirror of the merged
version side (#22821 / #22940 / #22944 / #22961). Rebased onto current
main; supersedes the original shared-UUID version of this PR.
## What
Gives `core.workflow` a per-workspace copy of each workflow (`name`,
`lastPublishedVersionId`), soft-reffed from the workspace record via
`coreWorkflowId`, so app-shipped workflows have a core home. Does not
touch reads/dispatch (that's Phase B).
- **Sync service** (`WorkflowCoreSyncService`): core rows get their own
id (`uuidv5(workspaceId:recordId)`), the workspace record links via
`coreWorkflowId` (written back after the upsert), and the write-back is
**guarded** on the `coreWorkflowId` field being present (skips with a
warning otherwise — mirrors #22940). Injected repo renamed
`coreWorkflowRepository`.
- **Dual-write listener** on the `workflow` object:
CREATED/UPDATED/RESTORED upsert, DELETED/DESTROYED delete by
`coreWorkflowId`. Always-on; failures routed to Sentry so they never
break the user write.
- **2-20 backfill** (`backfill-workflow-to-core`): reads via the
provided `RunOnWorkspaceArgs.dataSource`, upserts each workspace
workflow into core.
- **2-22 provisioning** (mirrors #22944/#22961):
- `add-workflow-core-soft-ref-field`: adds the `coreWorkflowId` system
field on existing workspaces (flat-entity legacy migration).
- `backfill-workflow-core-links`: full rebuild — per workspace, in one
raw-SQL transaction, wipes all `core.workflow` rows, inserts a fresh
own-id row per workflow, and re-links every record. (No trigger-map
cache to invalidate on `core.workflow`.)
Simpler than the version side: `core.workflow` has no
one-active-per-workflow index and no trigger-map cache, and it was never
backfilled in prod, so there are no legacy shared-id rows.
## Test
Fresh `database:reset` + full sequence (2-20 backfill → 2-22 add-field →
2-22 rebuild link): 4/4 workspace records linked via `coreWorkflowId`
(id != coreWorkflowId), links resolve, **0 dangling**, no duplicate core
rows, names populated. Typecheck + lint + oxfmt clean.
Thomas Trompette
87729a2822