chore: add local dev toolchain environment

.gitignore

@@ -74,6 +74,7 @@ chanora-docs-repo-format-*.zip
 **/Cargo.lock.bak
 
 # Flutter / Dart generated (but keep pubspec.lock for the PoC apps)
+.flutter-home/
 **/.dart_tool/
 **/.flutter-plugins
 **/.flutter-plugins-dependencies

tools/dev-env.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Source this file before local verification commands:
+#   source tools/dev-env.sh
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd "${script_dir}/.." && pwd)"
+
+if [[ -x "${repo_root}/.flutter-home/flutter/bin/flutter" ]]; then
+  export PATH="${repo_root}/.flutter-home/flutter/bin:${PATH}"
+elif [[ -n "${FLUTTER_HOME:-}" && -x "${FLUTTER_HOME}/bin/flutter" ]]; then
+  export PATH="${FLUTTER_HOME}/bin:${PATH}"
+elif [[ -x "${HOME}/sdks/flutter/bin/flutter" ]]; then
+  export PATH="${HOME}/sdks/flutter/bin:${PATH}"
+fi
+
+if [[ -d "${HOME}/.cargo/bin" ]]; then
+  export PATH="${HOME}/.cargo/bin:${PATH}"
+fi