infra: Dockerfile + Railway config for the ingest sweep worker

packages/ingest/Dockerfile

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+# Built from the monorepo root context. The v2 ingest sweep worker: no HTTP server,
+# it loops `sweep` on an interval and talks to core over LOCKSTEP_API_URL.
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY . .
+RUN npm install
+RUN npm run build -w @lockstep/ingest
+
+FROM node:20-alpine AS run
+WORKDIR /app
+ENV NODE_ENV=production
+COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/packages/ingest ./packages/ingest
+# Loop: fetch → distill → propose, every 15 min (serve default). Env: LOCKSTEP_API_URL,
+# LOCKSTEP_INGEST_TOKEN, COMPOSIO_API_KEY, ANTHROPIC_API_KEY.
+CMD ["node", "packages/ingest/dist/index.js", "serve"]

railway.ingest.json

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+{
+  "$schema": "https://railway.app/railway.schema.json",
+  "build": {
+    "builder": "DOCKERFILE",
+    "dockerfilePath": "packages/ingest/Dockerfile"
+  },
+  "deploy": {
+    "restartPolicyType": "ON_FAILURE",
+    "restartPolicyMaxRetries": 5
+  }
+}