fix(rust): ensure chat-server and stream-server compile in release mode

Add scripts/verify-rust-build.sh to verify all Rust crates (veza-common,
veza-chat-server, veza-stream-server) compile in release mode.
Phase 1 audit - P1.2

scripts/verify-rust-build.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Verify that all Rust services (veza-common, veza-chat-server, veza-stream-server) compile in release mode.
+# Usage: ./scripts/verify-rust-build.sh
+# Exit: 0 on success, 1 on failure
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+cd "$REPO_ROOT"
+
+echo "=== Verifying Rust build (release mode) ==="
+
+build_crate() {
+  local crate="$1"
+  echo ""
+  echo "Building $crate..."
+  if (cd "$crate" && cargo build --release); then
+    echo "  OK: $crate"
+    return 0
+  else
+    echo "  FAILED: $crate"
+    return 1
+  fi
+}
+
+failed=0
+
+build_crate "veza-common" || failed=1
+build_crate "veza-chat-server" || failed=1
+build_crate "veza-stream-server" || failed=1
+
+echo ""
+if [ $failed -eq 0 ]; then
+  echo "=== All Rust crates built successfully ==="
+  exit 0
+else
+  echo "=== Some Rust crates failed to build ==="
+  exit 1
+fi