fix: remove unused --typesBundle flag from seed-versions.sh

The pinned @subsquid/substrate-metadata-explorer@1.1.2 does not support a
--typesBundle option (it offers only --out, --archive, --chain), so
'make typegen-seed' / './scripts/seed-versions.sh' failed per network with
'error: unknown option --typesBundle' — masked by the script as a connection
warning, ending with 0 versions discovered.

The flag was never needed: the explorer fetches raw runtime metadata blobs
over --chain; the types bundle is a typegen-side concern (decoding pre-V14
custom types), not required to capture metadata. Verified the bundle-free
explorer output is byte-identical to the committed tfchainVersions.jsonl for
all devnet versions, including pre-V14 (v49-v67).

Keeps --chain (canonical chain RPC, no dependency on the archive). Also drops
the now-orphaned TYPES_BUNDLE variable and its existence guard, which only
existed to support the removed flag.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: sameh-farouk

scripts/seed-versions.sh

@@ -15,7 +15,6 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
 MASTER="$REPO_DIR/typegen/tfchainVersions.jsonl"
-TYPES_BUNDLE="$REPO_DIR/typegen/typesBundle.json"
 TMP_DIR=$(mktemp -d)
 
 # Network endpoints
@@ -35,12 +34,6 @@ cleanup() {
 }
 trap cleanup EXIT
 
-if [ ! -f "$TYPES_BUNDLE" ]; then
-    echo "Error: typesBundle.json not found at $TYPES_BUNDLE"
-    echo "Restore it from indexer/typesBundle.json first."
-    exit 1
-fi
-
 # Determine which networks to scan
 if [ $# -gt 0 ]; then
     SCAN_NETWORKS="$*"
@@ -72,7 +65,6 @@ for network in $SCAN_NETWORKS; do
 
     if npx squid-substrate-metadata-explorer \
         --chain "$endpoint" \
-        --typesBundle "$TYPES_BUNDLE" \
         --out "$outfile" 2>&1; then
 
         if [ -f "$outfile" ] && [ -s "$outfile" ]; then