Add standardised bump-version.sh script

Unified version bumping across all Allow2 SDKs:
  ./scripts/bump-version.sh prerelease --preid alpha
  ./scripts/bump-version.sh [patch|minor|major]

Handles language-specific version formats (npm, PEP 440,
Gradle, .csproj, CMake, git tags), commits, and tags.

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: Allow2CEO

scripts/bump-version.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# bump-version.sh — Standardised version bumping for Allow2 Node SDK
+# Usage: ./scripts/bump-version.sh [prerelease|patch|minor|major] [--preid alpha|beta|rc]
+#
+# Examples:
+#   ./scripts/bump-version.sh prerelease --preid alpha   # 2.0.0-alpha.6 → 2.0.0-alpha.7
+#   ./scripts/bump-version.sh prerelease --preid beta    # 2.0.0-alpha.7 → 2.0.0-beta.0
+#   ./scripts/bump-version.sh patch                       # 2.0.0-alpha.7 → 2.0.1
+#   ./scripts/bump-version.sh minor                       # 2.0.1 → 2.1.0
+#   ./scripts/bump-version.sh major                       # 2.1.0 → 3.0.0
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+BUMP="${1:-prerelease}"
+PREID=""
+if [[ "${2:-}" == "--preid" ]]; then PREID="${3:-alpha}"; fi
+
+OLD=$(node -p "require('./package.json').version")
+
+case "$BUMP" in
+  prerelease)
+    if [[ -n "$PREID" ]]; then
+      npm version prerelease --preid="$PREID" --no-git-tag-version
+    else
+      npm version prerelease --no-git-tag-version
+    fi
+    ;;
+  patch|minor|major)
+    npm version "$BUMP" --no-git-tag-version
+    ;;
+  *)
+    echo "Usage: $0 [prerelease|patch|minor|major] [--preid alpha|beta|rc]" >&2
+    exit 1
+    ;;
+esac
+
+NEW=$(node -p "require('./package.json').version")
+echo "$OLD → $NEW"
+
+git add package.json
+git commit -m "v$NEW"
+git tag "v$NEW"
+echo "Tagged v$NEW — push with: git push origin main --tags"