Phase 1: s-expression core library + test infrastructure

S-expression parser, evaluator, and primitive registry in shared/sexp/.
109 unit tests covering parsing, evaluation, special forms, lambdas,
closures, components (defcomp), and 60+ pure builtins.

Test infrastructure: Dockerfile.unit (tier 1, fast) and
Dockerfile.integration (tier 2, ffmpeg). Dev watch mode auto-reruns
on file changes. Deploy gate blocks push on test failure.

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

deploy.sh

@@ -44,6 +44,17 @@ fi
 echo "Building: ${BUILD[*]}"
 echo ""
 
+# --- Run unit tests before deploying ---
+echo "=== Running unit tests ==="
+docker build -f test/Dockerfile.unit -t rose-ash-test-unit:latest . -q
+if ! docker run --rm rose-ash-test-unit:latest; then
+  echo ""
+  echo "Unit tests FAILED — aborting deploy."
+  exit 1
+fi
+echo "Unit tests passed."
+echo ""
+
 for app in "${BUILD[@]}"; do
   echo "=== $app ==="
   docker build -f "$app/Dockerfile" -t "$REGISTRY/$app:latest" .