feat(cli): add interactive UI for artifact experimental setup (Fission-AI#560)

* feat(cli): add interactive UI for artifact experimental setup

Add animated welcome screen and searchable multi-select prompt when
running `openspec artifact-experimental-setup` without the --tool flag
in interactive mode. Users can now browse and select multiple tools
for setup instead of requiring the --tool flag.

- Add welcome screen with ASCII art animation
- Add searchable multi-select prompt component
- Support multi-tool setup in single command invocation

* fix(nix): update flake version and reset hash for rebuild

- Update version from 0.20.0 to 0.23.0 to match package.json
- Set pnpmDeps hash to empty string to trigger rebuild
- Fix update-flake.sh to work on macOS (use portable grep/sed)

CI will fail with correct hash which we'll then apply.

* fix(nix): set correct pnpmDeps hash

* feat(cli): improve error handling for multi-tool setup

- Continue setup for remaining tools when one fails
- Collect and report all failures at the end
- Only throw if all tools fail
- Show partial success summary (configured vs failed)

Author: TabishB

flake.nix

@@ -19,15 +19,15 @@
         {
           default = pkgs.stdenv.mkDerivation (finalAttrs: {
             pname = "openspec";
-            version = "0.20.0";
+            version = "0.23.0";
 
             src = ./.;
 
             pnpmDeps = pkgs.fetchPnpmDeps {
               inherit (finalAttrs) pname version src;
               pnpm = pkgs.pnpm_9;
               fetcherVersion = 3;
-              hash = "sha256-m/7IdY1ou9ljjYAcx3W8AyEJvIZfCBWIWxproQ/INPA=";
+              hash = "sha256-9s2kdvd7svK4hofnD66HkDc86WTQeayfF5y7L2dmjNg=";
             };
 
             nativeBuildInputs = with pkgs; [

pnpm-lock.yaml

@@ -41,8 +41,8 @@ sed "${SED_INPLACE[@]}" "s|hash = \"sha256-[^\"]*\"|hash = \"$PLACEHOLDER\"|" "$
 echo "    Building to get correct hash (this will fail)..."
 BUILD_OUTPUT=$(nix build 2>&1 || true)
 
-# Extract the correct hash from error output
-CORRECT_HASH=$(echo "$BUILD_OUTPUT" | grep -oP 'got:\s+\Ksha256-[A-Za-z0-9+/=]+' | head -1)
+# Extract the correct hash from error output (portable - works on macOS and Linux)
+CORRECT_HASH=$(echo "$BUILD_OUTPUT" | grep -o 'got:[[:space:]]*sha256-[A-Za-z0-9+/=]*' | head -1 | sed 's/got:[[:space:]]*//')
 
 if [ -z "$CORRECT_HASH" ]; then
   echo "❌ Error: Could not extract hash from build output"