Zettelkasten note tool

This skill appears to do what it says: manage a local Zettelkasten vault and needs only optional ZK_VAULT and EDITOR environment variables. Before installing or running it: - Review the script yourself (it is provided) and run it from a user account you control. The code is local-file oriented and does not phone home. - Be cautious with the EDITOR environment variable: the script uses os.system(f'{editor} "{path}"'). If EDITOR is set to a malicious string (or contains shell metacharacters), that could execute undesired shell commands. Prefer setting EDITOR to a trusted program (e.g., vim, nano) or modify the script to use subprocess.run([...], shell=False). - Be mindful of ZK_VAULT: if you override the vault path, the tool will scan and read all .md files under that path. Don’t point it at directories containing sensitive files. - If you plan to allow autonomous invocation by an agent, consider whether automatic file creation/editing is acceptable; you can require explicit user invocation instead. - If you want extra safety, run the script in a confined environment (different user account, container, or VM) until you’re comfortable with behavior.