## Summary
Step 2 of the manual-trigger output schema restructuring (expand →
display → migrate → contract).
Builds on the now-merged #21676 (which expanded the runtime payload to
serve `payload` and `metadata` siblings at the trigger root). This PR
**surfaces** those in the variable picker as nested, expandable nodes:
- `trigger.payload.{record fields}` — the record(s) that triggered the
run
- `trigger.metadata.workspaceMemberId` — who triggered it
The flat root fields (`trigger.id`, etc.) remain available, so existing
saved variable references keep working until a later migration phase
moves them.
### Changes
- **twenty-shared**: metadata/payload label constants +
`build-manual-trigger-metadata-node` util + barrel exports.
- **twenty-front**: `computeStepOutputSchema` MANUAL branch now nests
`payload` (RecordNode for SINGLE_RECORD, array Node for BULK_RECORDS,
omitted for GLOBAL) and `metadata`; `ManualTriggerOutputSchema` type
updated to `{ payload?; metadata }`.
- **twenty-server**: `computeTriggerOutputSchemaFromAvailability`
mirrors the same nested shape for server-side validation.
The key is `metadata` (not `_metadata`) — custom fields can't start with
`_`, so collision risk was deemed acceptable.
## Test plan
- [x] `npx nx build twenty-shared`
- [x] `computeStepOutputSchema` unit tests pass (55)
- [x] Manual: create a manual-trigger workflow (GLOBAL / single-record /
bulk), confirm the picker shows `payload` and `metadata` as expandable
folders and that selecting a field yields `{{trigger.payload.<field>}}`
/ `{{trigger.metadata.workspaceMemberId}}`
> Note: server typecheck has pre-existing unrelated failures on main
(Stripe billing mocks, gmail mocks); none touch workflow files.
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Thomas Trompette
105f9565a5
