Phase 6a (cont.): reconcile editor toolchain with the rename

Updated the LSP indexer (ludic_index.h), completion snippets (ludic_lsp.c),
check-docs wrapper, and the fmt/LSP test fixtures (test-tools.sh, test-lsp.py)
to the new keywords. Fixed two pre-existing bugs surfaced along the way:
build-tools.sh had a set -e bug (a failing find|while pipeline in a command
substitution) that silently prevented ALL rebuilds since the first build, so the
editor binaries were stale; and an LSP test offset was calibrated to the old
keyword length. test.sh 14/14, test-tools 28/0, check-docs + check-vocabulary
green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/build-tools.sh

@@ -25,8 +25,8 @@ build_one() {
   if [ -x "$OUT/$name" ]; then
     newest=$(find "$SRC" -name '*.h' -o -name "$(basename "$main")" | while read -r f; do
       [ "$f" -nt "$OUT/$name" ] && echo new
-    done)
-    [ -z "$newest" ] && { echo "$name: up to date"; return; }
+    done) || true
+    if [ -z "$newest" ]; then echo "$name: up to date"; return; fi
   fi
   echo "cc: $main -> $OUT/$name"
   $CC $CFLAGS "$main" -o "$OUT/$name"