0.3.13

• Add jpterm execute to run a whole notebook or a selected cell, locally or on a Jupyter server.
• Preserve local kernel state between CLI calls using detached notebook sessions.
• Add jpterm kernel start, list, and stop for local and remote notebook kernels.
• Share local notebook kernels between the TUI and CLI, with ownership-based cleanup on TUI exit.
• Add Ctrl+W to close TUI tabs, with confirmation for unsaved changes.
• Clean up editor observers and background tasks when tabs close.
• Fix kernel startup and shutdown races, and handle Windows Python launcher processes.

This release also releases:

• txl 0.3.5
• txl_cell 0.3.10
• txl_console 0.3.10
• txl_editors 0.3.9
• txl_file_browser 0.3.9
• txl_image_viewer 0.3.9
• txl_jpterm 0.3.10
• txl_kernel 0.3.12
• txl_launcher 0.3.9
• txl_local_contents 0.3.10
• txl_local_kernels 0.3.10
• txl_local_terminals 0.3.10
• txl_markdown_viewer 0.3.9
• txl_notebook_editor 0.3.10
• txl_remote_contents 0.3.10
• txl_remote_kernels 0.3.10
• txl_remote_terminals 0.3.9
• txl_terminal 0.3.9
• txl_text_editor 0.3.9
• txl_widgets 0.3.10