Initialize Tilt-based local dev setup

Tiltfile

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+# --- OpenStaticFish MicroServices Tiltfile ---
+#
+# Nix-managed dependencies:
+#   Run `nix develop` or use `nix run .#tilt -- up` to enter the dev shell
+#   with tilt, kubectl, docker, and all other deps available.
+#
+# Quick reference:
+#   nix run .#setup-kind  - Create/select local Kind cluster
+#   tilt up        - Start all services (live reload enabled)
+#   tilt down      - Tear down all deployed resources
+#   tilt ui        - Open the Tilt web UI (default: http://localhost:10350)
+#   tilt logs      - Stream aggregated logs
+#   tilt status    - Show resource status
+
+# --- Global Settings ---
+# Nix command wrapper:
+#   nix run .#setup-kind
+#
+# This creates/selects the supported local Kind context below.
+allow_k8s_contexts('kind-openstaticfish')
+
+# --- Hello World Service ---
+# Builds the Docker image and deploys the manifest with live reload
+docker_build('hello-world', './services/hello-world')
+
+k8s_yaml('./k8s/hello-world.yaml')
+
+# Watch source files for live reload
+k8s_resource(
+    workload='hello-world-deployment',
+    port_forwards='8080:8080',
+    labels=['hello-world'],
+)
+
+# --- Local Resources ---
+# Run a simple health check as a local resource
+local_resource(
+    'health-check',
+    cmd='curl -sf http://localhost:8080/health || echo "Service not ready"',
+    resource_deps=['hello-world-deployment'],
+    labels=['utility'],
+)