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.
Replace the fish `read` prompt (which showed an unstyled `read>` and left the
prompt line behind on redraw) with an in-place editor built on the raw key
reader. The value is edited directly in its UI field with a block caret; the
panel redraws each keystroke and cleans up on exit. Pre-fills the current value;
Backspace deletes, Enter saves (empty reverts to default), Esc cancels.
- __config_settings_read_key: decode Backspace (bytes 8/127)
- __config_settings_draw_value: edit-mode field with caret + edit hint line
- config-settings: inline edit loop replaces the read-based prompt block
- C1: sponge_purge_only_on_exit / sponge_allow_previously_successful are 'bool'
rows that write true/false (sponge's convention), not on/off; badge maps
true->ON, false->OFF, unset->DEFAULT
- I1: shorten value-page hint to 49 cols so it fits the 50-wide tier
- M1: set -U -- before the var name guards typed values beginning with a dash
rootiest
