build(simulator): Dockerfile, compose, and make targets

Per docs/superpowers/plans/2026-06-04-experience-simulator.md Task 6.
Dockerfile also copies tools/ (a declared setuptools package) so the
editable install resolves inside the image; the plan's Dockerfile omitted it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

simulator/docker-compose.yml

@@ -0,0 +1,7 @@
+services:
+  simulator:
+    build:
+      context: ..
+      dockerfile: simulator/Dockerfile
+    ports:
+      - "8000:8000"