mavend: centralize action validation boundary (slice 4)

.githooks/commit-msg

@@ -1,30 +0,0 @@
-#!/bin/sh
-# Every commit names the Vikunja task it belongs to.
-#
-#   router: narrow the single-token rule (V-359)
-#
-# V- and not #, because Gitea autolinks #359 to a Gitea issue, which is a
-# different tracker and a wrong link.
-#
-# Exempt: merges, reverts, fixup/squash, and the initial commit.
-
-msg_file=$1
-subject=$(sed -n '1p' "$msg_file")
-
-case "$subject" in
-	Merge\ *|Revert\ *|fixup!\ *|squash!\ *|amend!\ *) exit 0 ;;
-esac
-
-if [ -f "$(git rev-parse --git-dir)/MERGE_HEAD" ]; then
-	exit 0
-fi
-
-if printf '%s' "$subject" | grep -qE '\(V-[0-9]+\)$'; then
-	exit 0
-fi
-
-echo "commit-msg: subject must end with a Vikunja task ref." >&2
-echo "  got:  $subject" >&2
-echo "  want: router: narrow the single-token rule (V-359)" >&2
-echo "  No task yet? Create one. Work without a task is work nobody can resume." >&2
-exit 1