Run the refresh hook before its transaction and keep the inhibitor through user work

Three review findings on the update-hook boundary:

The pre-refresh-pacman hook had been moved after the refresh transaction
and, during a channel switch, deferred to the very end. That defeated the
hook's purpose: custom repositories and IgnorePkg entries were not in
place when the downgrade-capable -Syyuu ran. Run the hook where it used
to run, after the package config is re-synced and before the transaction,
but cold: revoke the timestamp, run it behind the no-update wrapper with
the caller's original PATH, and revoke again before continuing. Every
later privileged command authenticates with --no-update, so a detached
child left by the hook has no reusable timestamp to wait for. Channel
switching hands the caller's PATH to the refresh the same way the updater
receives it, and no longer defers or re-runs the hook.

Stay Awake was released before AUR builds, hooks and mise, so the machine
could sleep during the longest part of an update. Releasing the inhibitor
needs no privilege because the held command already dropped to the user,
so stop it after mise and before the reboot prompt, as before.

A packaged channel destination cannot be inspected before its package is
installed, and a transaction can replace the running tree with a release
that predates the command-scoped wrapper; from then on a bare sudo would
resolve to /usr/bin/sudo and publish a timestamp, and the destination's
own updater authenticates the same way. The switch used to abort only
after the packages had changed, with generic rerun advice. Now it checks
for the wrapper after each transaction before any further privileged
step, completes what it safely can, and stops cold with instructions to
run that release's update from a fresh session instead of launching it.

Boundary tests pin the hook between the config copies and the transaction
with a cold timestamp on both sides, the older-destination stop with its
guidance and no launched updater, the new inhibitor position, and the
post-update hook staying unreached on failures and signals. Docs, the
manual and the sample hook describe the restored timing.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

test/shell.d/channel-test.sh

@@ -127,7 +127,7 @@ assert_log_line() {
 }
 
 run_channel stable
-assert_log_line $'refresh\tstable\tdefer-hook' "stable refreshes the stable pacman channel"
+assert_log_line $'refresh\tstable' "stable refreshes the stable pacman channel"
 assert_log_line $'update-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy\tomarchy-settings' "stable installs stable Omarchy packages"
 assert_log_line $'unlink\t--no-reboot' "stable restores the package-backed Omarchy path without an early reboot prompt"
 assert_log_line $'update\t-y\tOMARCHY_PATH='"$package_root" "stable runs the normal update pipeline from the package-backed path"
@@ -137,7 +137,7 @@ fi
 pass "stable does not require reboot when already package-backed"
 
 run_channel rc
-assert_log_line $'refresh\trc\tdefer-hook' "rc refreshes the rc pacman channel"
+assert_log_line $'refresh\trc' "rc refreshes the rc pacman channel"
 assert_log_line $'update-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy\tomarchy-settings' "rc installs rc Omarchy packages"
 assert_log_line $'unlink\t--no-reboot' "rc restores the package-backed Omarchy path without an early reboot prompt"
 assert_log_line $'update\t-y\tOMARCHY_PATH='"$package_root" "rc runs the normal update pipeline from the package-backed path"
@@ -145,7 +145,7 @@ assert_log_line $'update\t-y\tOMARCHY_PATH='"$package_root" "rc runs the normal
 active_checkout="$test_tmp/active-checkout"
 cp -a "$package_root" "$active_checkout"
 OMARCHY_TEST_PATH="$active_checkout" run_channel edge
-assert_log_line $'refresh\tedge\tdefer-hook' "edge refreshes the edge pacman channel"
+assert_log_line $'refresh\tedge' "edge refreshes the edge pacman channel"
 assert_log_line $'update-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy-dev\tomarchy-settings-dev' "edge installs development Omarchy packages"
 assert_log_line $'unlink\t--no-reboot' "edge unlinks dev without an early reboot prompt"
 assert_log_line $'state\tset\treboot-required' "edge marks reboot required when leaving dev"
@@ -161,7 +161,7 @@ if run_channel dev >"$test_tmp/occupied.out" 2>"$test_tmp/occupied.err"; then
 fi
 
 grep -q "already exists and is not a git checkout" "$test_tmp/occupied.err" || fail "dev explains occupied checkout paths" "$(cat "$test_tmp/occupied.err")"
-if grep -Fx $'refresh\tedge\tdefer-hook' "$log_file" >/dev/null; then
+if grep -Fx $'refresh\tedge' "$log_file" >/dev/null; then
   fail "dev validates checkout path before changing packages" "$(cat "$log_file")"
 fi
 pass "dev refuses occupied non-checkout paths before package changes"
@@ -169,17 +169,15 @@ pass "dev refuses occupied non-checkout paths before package changes"
 rmdir "$checkout"
 run_channel dev
 assert_log_line $'gum\tconfirm\t--default=false\tSwitch to dev channel?' "dev asks for confirmation"
-assert_log_line $'refresh\tedge\tdefer-hook' "dev refreshes the edge pacman channel"
+assert_log_line $'refresh\tedge' "dev refreshes the edge pacman channel"
 assert_log_line $'update-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy-dev\tomarchy-settings-dev' "dev installs development Omarchy packages"
 assert_log_line $'git\tclone\thttps://github.com/omacom/omarchy.git\t'"$checkout" "dev clones the source checkout to ~/omarchy"
 assert_log_line $'link\t'"$checkout"$'\t--no-reboot' "dev links ~/omarchy without an early reboot prompt"
 assert_log_line $'state\tset\treboot-required' "dev defers the reboot prompt to the update pipeline"
 assert_log_line $'update\t-y\tOMARCHY_PATH='"$checkout" "dev runs the normal update pipeline from the source checkout"
-[[ $(grep -E '^(git|link|state|refresh|sudo|update)' "$log_file" | sed '/run-deferred/d') == $'git\tclone\thttps://github.com/omacom/omarchy.git\t'"$checkout"$'\nlink\t'"$checkout"$'\t--no-reboot\nstate\tset\treboot-required\nrefresh\tedge\tdefer-hook\nupdate-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy-dev\tomarchy-settings-dev\nupdate\t-y\tOMARCHY_PATH='"$checkout" ]] ||
+[[ $(grep -E '^(git|link|state|refresh|sudo|update)' "$log_file") == $'git\tclone\thttps://github.com/omacom/omarchy.git\t'"$checkout"$'\nlink\t'"$checkout"$'\t--no-reboot\nstate\tset\treboot-required\nrefresh\tedge\nupdate-pacman\t-S\t--needed\t--noconfirm\t--ask\t4\tomarchy-dev\tomarchy-settings-dev\nupdate\t-y\tOMARCHY_PATH='"$checkout" ]] ||
   fail "dev activates the checkout before changing or updating packages" "$(cat "$log_file")"
 pass "dev activates the checkout before changing or updating packages"
-[[ $(tail -1 "$log_file") == $'refresh\tedge\trun-deferred' ]] || fail "channel refresh hook must run after the complete update"
-pass "channel changes defer the refresh hook until all update work finishes"
 
 OMARCHY_TEST_PATH="$checkout" run_channel stable
 assert_log_line $'unlink\t--no-reboot' "switching from dev to stable unlinks without an early reboot prompt"