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-agent-hermes/src/index.ts

@@ -33,7 +33,7 @@ function throwHermesSpawnError(error: SpawnCliError): never {
 export function createHermesAgent(config: HermesAgentConfig): AdapterFn {
   const timeoutMs = config.timeout;
 
-  return createTextAdapter(async (ctx, prompt) => {
+  return createTextAdapter(async (ctx, prompt, _runtime) => {
     const validated = validateHermesAgentConfig(config);
     if (!validated.ok) {
       throw new Error(validated.error);