feat(kitty): add per-session watcher setup reminder

conf.d/kitty-watcher-reminder.fish

@@ -0,0 +1,21 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# C5 — Logging & Capture: a non-blocking, per-session reminder shown inside Kitty
+# when the fish-config scrollback watcher is not yet set up. It never blocks the
+# shell; it simply prints how to enable or silence it. The notice stops once the
+# user runs `kitty-logging install` (a watcher line then exists in kitty.conf) or
+# `kitty-logging dismiss` (sets the universal variable below).
+
+status is-interactive; or exit
+type -q kitty; or exit
+set -q KITTY_WINDOW_ID; or exit
+__fish_config_op_enabled __fish_config_op_logging; or exit
+__fish_variable_check __fish_config_kitty_watcher_dismissed; and exit
+__kitty_logging_has_watcher; and exit
+
+set_color --bold yellow
+echo "Kitty session logging is available but not set up."
+set_color normal
+echo "  Enable:  kitty-logging install"
+echo "  Silence: kitty-logging dismiss"