fix(pi): normalize empty sandbox provider

Author: Bill Leoutsakos

apps/sim/lib/execution/remote-sandbox/pi-lifetime.test.ts

@@ -38,6 +38,12 @@ describe('resolvePiSandboxLifetimeMs', () => {
     expect(lifetime).toBe(max)
   })
 
+  it('matches provider selection by treating an empty provider as E2B', async () => {
+    const { lifetime, max } = await resolveWith({ provider: '' })
+
+    expect(lifetime).toBe(max)
+  })
+
   it('has no lifetime to report when the provider stops on inactivity', async () => {
     // Daytona has no absolute lifetime, so reporting E2B's would cut the agent
     // turn to fit a ceiling that does not apply — the regression this prevents.

apps/sim/lib/execution/remote-sandbox/pi-lifetime.ts

@@ -15,7 +15,7 @@ const logger = createLogger('PiSandboxLifetime')
  * its header describes: no provider adapters, no barrel, no config gate.
  */
 function isLifetimeProvider(): boolean {
-  return (env.SANDBOX_PROVIDER?.toLowerCase() ?? 'e2b') === 'e2b'
+  return (env.SANDBOX_PROVIDER || 'e2b').toLowerCase() === 'e2b'
 }
 
 /**