Register custom $first(role) and $last(role) functions in the JSONata
evaluator. These search the steps array and return the matching role's
frontmatter (output) directly, replacing verbose steps[-1].output.x
expressions with semantic $last('role').field syntax.
- workflow-moderator: register functions via expr.registerFunction()
- Updated all condition expressions in .workflows/ and examples/
- Added tests for $last, $first, and unmatched role (undefined)
Fixes#376
Breaking change per review:
- Remove systemPrompt from RoleDefinition entirely
- identity/prepare/execute/report are now required (string, not nullable)
- Remove all legacy fallback logic in buildRolePrompt
- Simplify validate.ts, workflow.ts materialize
- Migrate all test fixtures and example workflows
Refs #359
xiaoju