fix(release-check): brace-delimit $VAR before full-width parens (set -u unbound var crash)

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

scripts/check-release.sh

@@ -49,7 +49,7 @@ if git rev-parse --git-dir >/dev/null 2>&1; then
     err "$BRANCH 領先 origin/$BRANCH $AHEAD 個 commit 未 push → **deploy 前先 git push**（否則 self-hosted 裝到舊 worker，重演壓測階段 6 的 seed 404）"
     GIT_BLOCK=1
   else
-    warn "$BRANCH vs origin/$BRANCH：ahead=$AHEAD behind=$BEHIND（確認狀態）"
+    warn "${BRANCH} vs origin/${BRANCH}：ahead=${AHEAD} behind=${BEHIND}（確認狀態）"
   fi
 else
   info "非 git repo，跳過 git 同步檢查"
@@ -77,7 +77,7 @@ fi
 if [ "$LOCAL_CLI" = "$REMOTE_CLI" ]; then
   ok "CLI 版本同步：本機 $LOCAL_CLI = npm $REMOTE_CLI"
 elif [ "$REMOTE_CLI" = "無法查線上" ] || [ "$REMOTE_CLI" = "無 npm CLI 可查" ]; then
-  info "本機 CLI $LOCAL_CLI（$REMOTE_CLI）"
+  info "本機 CLI ${LOCAL_CLI}（${REMOTE_CLI}）"
 else
   warn "CLI 版本漂移：本機 $LOCAL_CLI ≠ npm $REMOTE_CLI"
   warn "→ 跑 scripts/local-deploy.sh（含 cli/ 變動時）會 npm publish；或手動 cd cli && npm publish"
@@ -88,7 +88,7 @@ if git rev-parse --git-dir >/dev/null 2>&1; then
   LAST_CLI_PKG_CHANGE=$(git log -1 --format=%h -- cli/package.json 2>/dev/null || echo "")
   LAST_CLI_SRC_CHANGE=$(git log -1 --format=%h -- cli/src 2>/dev/null || echo "")
   if [ -n "$LAST_CLI_SRC_CHANGE" ] && [ "$LAST_CLI_SRC_CHANGE" != "$LAST_CLI_PKG_CHANGE" ]; then
-    info "cli/src 最後變動（$LAST_CLI_SRC_CHANGE）晚於 package.json（$LAST_CLI_PKG_CHANGE）→ 確認是否需 bump version"
+    info "cli/src 最後變動（${LAST_CLI_SRC_CHANGE}）晚於 package.json（${LAST_CLI_PKG_CHANGE}）→ 確認是否需 bump version"
   fi
 fi
 
@@ -100,7 +100,7 @@ if command -v curl >/dev/null 2>&1; then
   if [ "$CODE" = "200" ]; then
     ok "https://cypher.arcrun.dev/health → 200"
   else
-    warn "https://cypher.arcrun.dev/health → $CODE（部署中或不可達？）"
+    warn "https://cypher.arcrun.dev/health → ${CODE}（部署中或不可達？）"
   fi
 else
   info "無 curl，跳過線上健康檢查"
@@ -111,7 +111,7 @@ echo ""
 echo "【MCP server（arcrun/mcp/，已進主庫）】"
 if [ -d mcp ] && [ -f mcp/wrangler.toml ]; then
   MCP_NAME=$(grep '^name' mcp/wrangler.toml | head -1 | sed -E 's/^name[[:space:]]*=[[:space:]]*"([^"]*)".*/\1/')
-  ok "arcrun/mcp/ 存在（worker: $MCP_NAME）；由 local-deploy.sh 一併 wrangler deploy"
+  ok "arcrun/mcp/ 存在（worker: ${MCP_NAME}）；由 local-deploy.sh 一併 wrangler deploy"
   info "薄殼一致性：MCP 工具集應對齊 cypher-executor 最新 API（rule 07）"
   info "用戶連哪台 MCP 由 .mcp.json 決定（acr mcp-setup 依 config mcp_url 產）"
 else