feat: add Debian package building to CI pipeline and local build

Support DEB packaging alongside RPM for Debian trixie (13/stable),
forky (14/testing), Ubuntu noble (24.04 LTS), and plucky (25.04).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-deb.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+cd "$PROJECT_ROOT"
+
+# Load .env if present
+if [ -f .env ]; then
+  set -a; source .env; set +a
+fi
+
+# Ensure tools are on PATH
+export PATH="$HOME/.npm-global/bin:$HOME/.bun/bin:$HOME/.local/bin:$PATH"
+
+# Check if binaries already exist (build-rpm.sh may have been run first)
+if [ ! -f dist/mcpctl ] || [ ! -f dist/mcpctl-local ]; then
+  echo "==> Binaries not found, building from scratch..."
+  echo ""
+
+  echo "==> Running unit tests..."
+  pnpm test:run
+  echo ""
+
+  echo "==> Building TypeScript..."
+  pnpm build
+
+  echo "==> Generating shell completions..."
+  pnpm completions:generate
+
+  echo "==> Bundling standalone binaries..."
+  mkdir -p dist
+
+  # Ink optionally imports react-devtools-core which isn't installed.
+  # Provide a no-op stub so bun can bundle it (it's only invoked when DEV=true).
+  if [ ! -e node_modules/react-devtools-core ]; then
+    ln -s ../src/cli/stubs/react-devtools-core node_modules/react-devtools-core
+  fi
+
+  bun build src/cli/src/index.ts --compile --outfile dist/mcpctl
+  bun build src/mcplocal/src/main.ts --compile --outfile dist/mcpctl-local
+else
+  echo "==> Using existing binaries in dist/"
+fi
+
+echo "==> Packaging DEB..."
+rm -f dist/mcpctl-*.deb dist/mcpctl_*.deb
+nfpm pkg --packager deb --target dist/
+
+DEB_FILE=$(ls dist/mcpctl*.deb 2>/dev/null | head -1)
+echo "==> Built: $DEB_FILE"
+echo "    Size: $(du -h "$DEB_FILE" | cut -f1)"
+dpkg-deb --info "$DEB_FILE" 2>/dev/null || true