pardes - reads stdin into a +Pager pane, and is a terminal's PAGER and GIT_PAGER, Pager pardes|off to opt out; command panes page through cat

A paging command in a terminal, or run through its pty/run, sat in
less, and a pty/run never answered. `pardes -` now reads stdin to its
end, strips terminal escapes (colour, OSC, overstrike), and shows it:
inside a session as a clean <cwd>/+Pager pane made through pane/new and
back at once, outside one as a new editor whose first pane it is, as
`vim -` does. A terminal's shell gets PAGER and GIT_PAGER set to this
pardes's own path and `-` where the user's environment sets neither;
`Pager off`, a setting in /ctl, init and DumpConfig, leaves terminals
started after it to the environment. A command pane's one-shot shell
keeps cat, its output being a pane already.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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