fix(logging): register C5 event handlers in conf.d for reliable startup

--on-variable handlers in functions/ are only autoloaded on explicit call,
so they never fire when a universal variable changes. Moving the definitions
to conf.d/logging-events.fish ensures they are registered at shell init.

Also adds a startup __fish_config_sync_logging call so pre-set variable
values (e.g. set before this shell was opened) take effect immediately
without requiring a re-set.

functions/__fish_config_logging_changed.fish

@@ -1,21 +0,0 @@
-# Copyright (C) 2026 Rootiest
-# SPDX-License-Identifier: AGPL-3.0-or-later
-
-# SYNOPSIS
-#   __fish_config_logging_changed
-#
-# DESCRIPTION
-#   Event handler that fires in every running shell when
-#   __fish_config_op_logging is set or erased. Delegates to
-#   __fish_config_sync_logging to update the Kitty sentinel file and
-#   paru/yay wrappers immediately without requiring a shell restart.
-#
-# RETURNS
-#   0  Always
-#
-# EXAMPLE
-#   set -U __fish_config_op_logging 0  # triggers this automatically
-function __fish_config_logging_changed --on-variable __fish_config_op_logging \
-    --description 'C5 event handler: sync logging state when __fish_config_op_logging changes'
-    __fish_config_sync_logging
-end

functions/__fish_config_opinionated_changed.fish

@@ -1,24 +0,0 @@
-# Copyright (C) 2026 Rootiest
-# SPDX-License-Identifier: AGPL-3.0-or-later
-
-# SYNOPSIS
-#   __fish_config_opinionated_changed
-#
-# DESCRIPTION
-#   Event handler that fires in every running shell when
-#   __fish_config_opinionated (the master opinionated switch) is set or
-#   erased. Delegates to __fish_config_sync_logging to keep C5 logging
-#   state in sync. Logging is the only category with external on-disk
-#   state (sentinel file, wrapper scripts) that requires real-time
-#   synchronisation when the master variable changes; C1-C4 guards
-#   evaluate at call-time and need no event handler.
-#
-# RETURNS
-#   0  Always
-#
-# EXAMPLE
-#   set -U __fish_config_opinionated 0  # triggers this automatically
-function __fish_config_opinionated_changed --on-variable __fish_config_opinionated \
-    --description 'C5 event handler: sync logging state when master opinionated switch changes'
-    __fish_config_sync_logging
-end