x/fix task execution - Githubissues

:rocket:	This description was created by Ellipsis for commit 7722e8b730c9b4957ed3b8ab37788e42dce24eb0

Enhanced task execution by updating typespecs, fixing tests, and adding error handling across multiple files.

Key points:

feat: Update typespec
fix(agents-api): Fix tests. 100% passing
feat: Add error message to execution if failed
Updated instructions field in agents-api/agents_api/autogen/Agents.py to default to an empty list.
Added output and error fields to CreateExecutionRequest and Execution in agents-api/agents_api/autogen/Executions.py.
Modified jobs and docs fields in BaseChatResponse in agents-api/agents_api/autogen/Chat.py to be read-only.
Introduced SchemaCompletionResponseFormat and SimpleCompletionResponseFormat in agents-api/agents_api/autogen/Chat.py.
Updated TransitionType and ExecutionStatus in agents-api/agents_api/autogen/openapi_model.py to include new states like init_branch and finish_branch.
Enhanced validate_transition_targets function in agents-api/agents_api/models/execution/create_execution_transition.py to handle new transition types.
Refactored task_to_spec function in agents-api/agents_api/common/protocol/tasks.py to handle task specifications more robustly.
Updated tests in agents-api/tests/test_execution_workflow.py to cover new execution scenarios and error handling.
Added migration script agents-api/migrations/migrate_1725153437_add_output_to_executions.py to update the database schema for executions.
Updated TypeScript SDK models in sdks/ts/src/api/models to reflect changes in API response formats and execution handling.

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julep-ai / julep