fix(kb): stop DROP INDEX killing HNSW via Ladybug ghost catalog

Ladybug 0.19 DROP INDEX leaves `_0_Leaf_vec_UPPER` / `0_id_docs` in catalog so
CREATE fails while SHOW_INDEXES omits the index; create_fts_and_vector used to
swallow that. Never drop FTS/VECTOR; ensure_indexes after upserts; rebuild =
delete kb.lbug. Add compose.edelweiss.yml + regression tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

bin/docker-entrypoint

@@ -6,6 +6,8 @@
 #   brain index           bin/kb/index
 #   brain watch <dir>     watchdog re-indexer (bin/kb/watch)
 #   brain serve           async Go HTTP server (bin/serve)
+#   brain extract         bin/facts/extract (docker×compose pairing)
+#   brain audit           bin/facts/audit
 #
 # Usage comment starts at line 2 (self-describing convention).
 set -euo pipefail
@@ -19,5 +21,7 @@ case "$CMD" in
   index) exec "$KB_PY" /app/bin/kb/index "$@" ;;
   watch) exec /app/bin/watch "$@" ;;
   serve) exec /app/bin/serve "$@" ;;
+  extract) exec "$KB_PY" /app/bin/facts/extract "$@" ;;
+  audit) exec "$KB_PY" /app/bin/facts/audit "$@" ;;
   *) echo "unknown command: $CMD" >&2; exit 2 ;;
-esac
+esac