fix: use wrapper script for claude instead of PATH modification

Create /usr/local/bin/claude wrapper that remounts / read-write before
calling the real binary. Removes PATH append to ~/.bashrc which was
duplicating on every provision run.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system/clearpilot/provision.sh

@@ -38,7 +38,12 @@ sudo apt-get install -y nodejs
 mount -o rw,remount /
 echo "Installing Claude Code..."
 curl -fsSL https://claude.ai/install.sh | bash
-echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.bashrc && source ~/.bashrc
+cat > /usr/local/bin/claude <<'WRAPPER'
+#!/bin/bash
+sudo mount -o rw,remount /
+exec /root/.local/bin/claude "$@"
+WRAPPER
+chmod +x /usr/local/bin/claude
 echo "Packages installed"
 
 # Decrypt and install SSH identity keys (for git auth)