refactor: cursor-agent uses runtime.extract for workspace detection

- Remove llmProvider and workspace from CursorAgentConfig (now just command/model/timeout)
- extractWorkspacePath uses runtime.extract + runtime.cas instead of standalone reactor
- TextProducerFn signature gains runtime parameter: (ctx, prompt, runtime)
- develop-entry.ts hardcodes cursor-agent path, no more env var dependency
- Drop @uncaged/workflow-reactor dep from workflow-agent-cursor
- Update tests for simplified config

小橘 <xiaoju@shazhou.work>

packages/workflow-template-develop/src/roles/planner.ts

@@ -63,5 +63,5 @@ export const plannerRole: RoleDefinition<PlannerMeta> = {
   description: "Breaks the task into sequential phases for the coder.",
   systemPrompt: PLANNER_SYSTEM,
   schema: plannerMetaSchema,
-  extractRefs: (meta) => meta.status === "planned" ? meta.phases.map((p) => p.hash) : [],
+  extractRefs: (meta) => (meta.status === "planned" ? meta.phases.map((p) => p.hash) : []),
 };