Improves error handling in the sandbox creation flow by ensuring that if the Docker container creation fails, the task is properly reset to NEW status and the error is propagated to the caller.

Previously, when sandbox creation failed, the error was caught but not re-thrown, causing the task command to continue execution and mark the task as in progress despite the failure. This resulted in an inconsistent state where the task appeared to be running but had no container.

Changes

• Modified Sandbox.createAndStart() to re-throw errors after failing the process manager item in packages/cli/src/lib/sandbox/types.ts:49-54
• Added mock for createSandbox in restart command tests to prevent actual Docker/Podman calls
• Added comprehensive E2E test case to verify task reset behavior when Docker container creation fails

Notes

This change ensures proper error propagation through the sandbox creation flow, allowing the task command to properly handle failures and reset task state when container creation fails.

Closes: #313