Extract the user-dots symlink logic into the __fish_user_dots_link helper and
add a dedicated __fish_user_dots_symlink toggle, surfaced as a 'Dots link' bool
row on the config-settings Paths page. Unlike the opinionated categories it has
no universal/session split — it acts on a literal path.
Setting it falsy (or toggling off) stops symlink generation and removes any
existing link immediately, honoured regardless of the C2 master switch.
Creation remains a C2 startup side-effect. config.fish now calls the helper.
Docs: README, fish-config.md (C2 table, Paths page, machine-local section),
and fish-config.index updated.
Point $__fish_config_dir/user-dots at $__fish_user_dots_path on interactive
startup so the private overlay can be browsed from the fish config dir. The
link is created if missing and repointed if the path variable changes, only
ever managing a symlink (never clobbering a real file/dir). Gated as a C2
startup side-effect (__fish_config_op_autoexec) and git-ignored.
Docs: README overlay section and fish-config.md C2 table updated.
rootiest
