refactor(scripts): simplify switch-network to env-var based approach

Single env var NETWORK=corp|home controls all proxy config.
Source from ~/.zshrc — sets http_proxy, NPM_CONFIG_REGISTRY,
PIP_TRUSTED_HOST, NODE_TLS_REJECT_UNAUTHORIZED automatically.
No more ~/.npmrc rewriting.

scripts/switch-network.sh

@@ -1,81 +1,52 @@
 #!/bin/bash
-# Toggle npm/pnpm between corporate proxy and direct (home) network.
+# ─────────────────────────────────────────────────────────────
+# Dual-network development setup
+# ─────────────────────────────────────────────────────────────
 #
-# Usage:
-#   source scripts/switch-network.sh corp    # AT&T / corporate proxy
-#   source scripts/switch-network.sh home    # Direct internet (home/VPN off)
-#   source scripts/switch-network.sh status  # Show current config
+# Controls: one env var — NETWORK=corp or NETWORK=home
 #
-# This modifies ~/.npmrc. Must be sourced (not executed) to affect current shell.
+# Usage (add to ~/.zshrc):
+#   export NETWORK=corp   # at work
+#   export NETWORK=home   # at home (or just unset it)
+#
+# Then source this file from ~/.zshrc:
+#   source "$HOME/code/mygh/learning_ai_common_plat/scripts/switch-network.sh"
+#
+# What it sets:
+#   NETWORK=corp → http_proxy, https_proxy, npm/pnpm registry, pip trusted-host
+#   NETWORK=home → all proxy vars unset, default registries
+# ─────────────────────────────────────────────────────────────
 
-set -euo pipefail
+_CORP_PROXY="http://cso.proxy.att.com:8080/"
+_CORP_NPM_REGISTRY="https://jfrog-pkg-proxy.it.att.com/artifactory/api/npm/att-npm-proxy-group/"
 
-NPMRC="$HOME/.npmrc"
-CORP_PROXY="http://cso.proxy.att.com:8080/"
-CORP_REGISTRY="https://jfrog-pkg-proxy.it.att.com/artifactory/api/npm/att-npm-proxy-group/"
-HOME_REGISTRY="https://registry.npmjs.org/"
+if [ "${NETWORK:-home}" = "corp" ]; then
+  # ── Corporate proxy ──
+  export http_proxy="$_CORP_PROXY"
+  export https_proxy="$_CORP_PROXY"
+  export HTTP_PROXY="$_CORP_PROXY"
+  export HTTPS_PROXY="$_CORP_PROXY"
+  export NPM_CONFIG_REGISTRY="$_CORP_NPM_REGISTRY"
+  export NPM_CONFIG_PROXY="$_CORP_PROXY"
+  export NPM_CONFIG_HTTPS_PROXY="$_CORP_PROXY"
+  export NPM_CONFIG_STRICT_SSL="false"
+  export PIP_TRUSTED_HOST="pypi.org files.pythonhosted.org"
+  export NODE_TLS_REJECT_UNAUTHORIZED="0"
+else
+  # ── Home / direct internet ──
+  unset http_proxy https_proxy HTTP_PROXY HTTPS_PROXY 2>/dev/null
+  unset NPM_CONFIG_REGISTRY NPM_CONFIG_PROXY NPM_CONFIG_HTTPS_PROXY 2>/dev/null
+  unset NPM_CONFIG_STRICT_SSL NODE_TLS_REJECT_UNAUTHORIZED 2>/dev/null
+  unset PIP_TRUSTED_HOST 2>/dev/null
+fi
 
-show_status() {
-  echo "=== Current npm config ==="
-  echo "  proxy:      $(npm config get proxy 2>/dev/null || echo 'not set')"
-  echo "  https-proxy: $(npm config get https-proxy 2>/dev/null || echo 'not set')"
-  echo "  registry:   $(npm config get registry 2>/dev/null || echo 'not set')"
-  if command -v pnpm &>/dev/null; then
-    echo "  pnpm store: $(pnpm store path 2>/dev/null || echo 'unknown')"
-  fi
-  echo ""
-  if [ -f "$NPMRC" ]; then
-    echo "=== ~/.npmrc ==="
-    cat "$NPMRC"
+# Quick status on new shell (only if interactive)
+if [[ $- == *i* ]]; then
+  if [ "${NETWORK:-home}" = "corp" ]; then
+    echo "🏢 NETWORK=corp — proxy active"
   else
-    echo "No ~/.npmrc found"
+    echo "🏠 NETWORK=home — direct internet"
   fi
-}
+fi
 
-set_corp() {
-  cat > "$NPMRC" <<EOF
-proxy=$CORP_PROXY
-https-proxy=$CORP_PROXY
-registry=$CORP_REGISTRY
-strict-ssl=false
-EOF
-  echo "✅ Switched to CORPORATE network"
-  echo "   proxy:    $CORP_PROXY"
-  echo "   registry: $CORP_REGISTRY"
-  echo ""
-  echo "   Lock files will resolve through JFrog proxy."
-  echo "   Run 'npm install' / 'pnpm install' as normal."
-}
-
-set_home() {
-  cat > "$NPMRC" <<EOF
-registry=$HOME_REGISTRY
-EOF
-  echo "✅ Switched to HOME network"
-  echo "   proxy:    (none)"
-  echo "   registry: $HOME_REGISTRY"
-  echo ""
-  echo "   Lock files will resolve from npmjs.org."
-  echo "   To regenerate clean lock files:"
-  echo "     rm package-lock.json && npm install"
-  echo "     rm pnpm-lock.yaml && pnpm install"
-}
-
-case "${1:-status}" in
-  corp|corporate|work)
-    set_corp
-    ;;
-  home|direct|off)
-    set_home
-    ;;
-  status|show)
-    show_status
-    ;;
-  *)
-    echo "Usage: source scripts/switch-network.sh [corp|home|status]"
-    echo ""
-    echo "  corp   — Enable corporate proxy (AT&T JFrog)"
-    echo "  home   — Direct internet (no proxy)"
-    echo "  status — Show current npm config"
-    ;;
-esac
+unset _CORP_PROXY _CORP_NPM_REGISTRY