feat: add exec pathPrepend config

src/agents/pi-tools.ts

@@ -81,6 +81,7 @@ function resolveExecConfig(cfg: ClawdbotConfig | undefined) {
     security: globalExec?.security,
     ask: globalExec?.ask,
     node: globalExec?.node,
+    pathPrepend: globalExec?.pathPrepend,
     backgroundMs: globalExec?.backgroundMs,
     timeoutSec: globalExec?.timeoutSec,
     cleanupMs: globalExec?.cleanupMs,
@@ -207,6 +208,7 @@ export function createClawdbotCodingTools(options?: {
     security: options?.exec?.security ?? execConfig.security,
     ask: options?.exec?.ask ?? execConfig.ask,
     node: options?.exec?.node ?? execConfig.node,
+    pathPrepend: options?.exec?.pathPrepend ?? execConfig.pathPrepend,
     agentId,
     cwd: options?.workspaceDir,
     allowBackground,