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6eaae2ca4d
Gives the production runtime (lfx serve) the same v2 contract as the langflow backend's POST /api/v2/workflows, built on the shared lfx.workflow layer. - New POST /workflows endpoint: WorkflowRunRequest in, WorkflowExecutionResponse (sync) or an SSE stream (langflow/agui protocols) out. flow_id resolves against the serve registry; per-request deepcopy+stamp mirrors the run/stream endpoints. - sync runs via run_graph_internal (the same primitive the backend sync path uses) so the converter sees the aggregated RunOutputs shape. - stream drives the run with a token-stream EventManager wired into execute_graph_with_capture and feeds queue events through the shared StreamAdapter; emits a terminal end so the adapter closes the run cleanly. - background and public modes are rejected (422); tweaks/data/files/globals and partial-run boundaries are rejected too (no per-request graph rebuild yet). - execute_graph_with_capture gains an optional event_manager param. Tests build a real ChatInput->ChatOutput flow (no mocks) and exercise sync, both stream protocols, and the guards. 329 lfx serve + contract tests pass.