fix: make gen deterministic with LC_ALL=C byte-order sort

Plain sort in scripts/gen-docs.sh is locale-dependent: category-less tool
keys start with '|', which collates after letters under the CI container's
locale (pos-config/pos-tree moved to the end of the tree/dispatch/filetable
blocks). The new Gitea Actions gate caught this as a gen-drift failure on a
clean checkout. Force LC_ALL=C for byte-order sort and regenerate the doc
(config/tree now deterministically sort after the letter categories).

scripts/gen-docs.sh

@@ -15,6 +15,10 @@ root="$(cd "$(dirname "$0")/.." && pwd)"
 mode="write"
 [ "${1:-}" = "--check" ] && mode="check"
 
+# Deterministic byte-order sorting regardless of host/CI locale (category-less
+# tool keys start with "|", which collates differently per-locale).
+export LC_ALL=C
+
 ctx="$root/DOC/AGENT_Context_Project.md"
 comp="$root/completions/pos.bash"