feat: add Justfile and docker-compose.dev.yml for local dev workflow

just up   — mounts local repo into container, streams logs, no rebuild needed
just up-d — same but detached; use `just logs` to follow
just build/rebuild — manage the base image
just open/status/down — day-to-day helpers
just ci-smoke — CI path (COPY-based, --quick-test-for-ci)

docker-compose.dev.yml overrides the COPY+quick-exit CMD with a volume
mount and persistent server so code changes are live immediately.

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

docker-compose.dev.yml

@@ -0,0 +1,12 @@
+services:
+  comfyui:
+    # Mount local repo live — no rebuild needed after code changes.
+    # Re-installs comfydv deps on each start (fast: jinja2 is likely cached).
+    volumes:
+      - .:/app/ComfyUI/custom_nodes/comfydv
+    command:
+      - sh
+      - -c
+      - |
+        pip install -q -r /app/ComfyUI/custom_nodes/comfydv/requirements.txt
+        exec python main.py --cpu --listen 0.0.0.0 --port 8188