fix(npm_global): initialize nvm for Node.js package managers

Problem:
- ESLint and Claude Code upgrades failing with "node: not found"
- pnpm successfully installs packages but version checks fail
- Multiple manual installations shadowing pnpm installs
- npm_global.sh runs in non-interactive shell without nvm loaded

Changes:
- Add nvm initialization to npm_global.sh before version checks
- Load nvm.sh with --no-use flag to avoid startup messages
- Activate default Node.js version for package manager access

Resolution:
- Removed manual installations at ~/.local/bin/{eslint,claude}
- ESLint upgraded: 9.37.0 → 9.39.1 (pnpm)
- Claude Code upgraded: 2.0.33 → 2.0.34 (pnpm)
- Version detection now works correctly in installer scripts

Author: CybotTM

scripts/installers/npm_global.sh

@@ -5,6 +5,13 @@ set -euo pipefail
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 . "$DIR/lib/install_strategy.sh"
 
+# Load nvm if available (needed for node-based package managers)
+export NVM_DIR="$HOME/.nvm"
+if [ -s "$NVM_DIR/nvm.sh" ]; then
+  . "$NVM_DIR/nvm.sh" --no-use
+  nvm use default >/dev/null 2>&1 || true
+fi
+
 TOOL="${1:-}"
 if [ -z "$TOOL" ]; then
   echo "Usage: $0 TOOL_NAME" >&2