Built-in (builtin:*) workflows are read-only at the store layer; reflect
that in the editor so users aren't misled into editing changes that can't
save. For a built-in: the node palette is disabled, the inspector fields are
wrapped in a disabled fieldset, Save/Delete are replaced by a "Read-only
built-in" label, and a "Duplicate to edit" action clones it into an editable
user workflow. handleSave/handleDeleteWorkflow also early-return for built-ins
as defense-in-depth.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Inspector for prompt nodes: executor picker (model via CustomModelDropdown,
agent, skill from discovered skills, CLI named script), auto-approve toggle,
per-node max retries, and a wait-for-user-input mode with a User input palette
preset. Task card shows a 'Needs input' badge for awaiting-user-input status;
the task modal workflow tab shows the node's question as a banner.
Add a React Flow (@xyflow/react) based WorkflowNodeEditor: a lazy-loaded modal
with a workflow list, a node palette (prompt/script/gate/merge-boundary),
drag-to-connect edges, a per-node inspector, and save with compile-validation
that surfaces non-linear graphs as a banner. Pure irToFlow/flowToIr mapping
round-trips the v1 IR plus editor layout. Reachable via a Graph editor button in
the Workflow Steps manager; mounted in AppModals behind a new modal-manager
flag. Adds a vendor-reactflow Vite chunk and a feature changeset.
