fix(vscode): make alpaca mcp launcher sh-compatible

.vscode/mcp.json

@@ -2,7 +2,7 @@
   "servers": {
     "alpaca": {
       "type": "stdio",
-      "command": "zsh",
+      "command": "sh",
       "args": [
         "${workspaceFolder}/scripts/mcp/alpaca-mcp-server.sh"
       ],

scripts/mcp/alpaca-mcp-server.sh

@@ -1,23 +1,23 @@
-#!/usr/bin/env zsh
-set -euo pipefail
+#!/usr/bin/env sh
+set -eu
 
-SCRIPT_DIR="${0:A:h}"
+SCRIPT_DIR="$(CDPATH= cd "$(dirname "$0")" && pwd -P)"
 ENV_FILE="${ALPACA_MCP_ENV_FILE:-${SCRIPT_DIR}/.env}"
 
-if [[ -f "${ENV_FILE}" ]]; then
+if [ -f "${ENV_FILE}" ]; then
   set -a
-  source "${ENV_FILE}"
+  . "${ENV_FILE}"
   set +a
 fi
 
-if [[ "${1:-}" == "--doctor" ]]; then
-  if [[ -f "${ENV_FILE}" ]]; then
+if [ "${1:-}" = "--doctor" ]; then
+  if [ -f "${ENV_FILE}" ]; then
     echo "ok: env file found (${ENV_FILE})"
   else
     echo "warn: env file not found (${ENV_FILE}); copy scripts/mcp/.env.example to scripts/mcp/.env"
   fi
 
-  if [[ -n "${ALPACA_API_KEY:-}" && -n "${ALPACA_SECRET_KEY:-}" ]]; then
+  if [ -n "${ALPACA_API_KEY:-}" ] && [ -n "${ALPACA_SECRET_KEY:-}" ]; then
     echo "ok: Alpaca credential variables are set"
   else
     echo "warn: ALPACA_API_KEY and/or ALPACA_SECRET_KEY are not set"