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feat: add template command (Ansible-style template rendering + copy)

Adds a new `template` command that renders a local Go text/template file
with the command's environment, registered variables, loaded secrets, and
the standard SPOT_* variables, then uploads the rendered result to a remote
host. Reuses the existing copy-push path so mkdir, force, chmod+x and sudo
work the same way as `copy`.

Includes a new TemplateInternal config struct, a Template() method on
execCmd, a dispatch case in Process.execCommand, schema updates, README
and llms.txt documentation, and integration tests covering basic render,
env, secrets, sudo, mkdir, chmod+x, error paths, and the cond field.