chore: archive Phase 1 P1 OpenSpec changes

Archive dockerfile, agntcy-alignment-docs, and nodejs-sdk changes
now that implementation is complete and pushed to develop.

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

openspec/changes/archive/2026-03-28-dockerfile/tasks.md

@@ -0,0 +1,14 @@
+## 1. Dockerfile
+
+- [x] 1.1 Write multi-stage Dockerfile: builder stage (node:18-alpine, npm ci, npm run build)
+- [x] 1.2 Write production stage: node:18-alpine, npm ci --omit=dev, copy dist/, USER node
+- [x] 1.3 Set EXPOSE 3000, CMD ["node", "dist/server.js"]
+
+## 2. .dockerignore
+
+- [x] 2.1 Write .dockerignore excluding: node_modules, dist, coverage, tests, .env, *.pem, vj_notes, .cto-workspace, .claude, next_steps.md
+
+## 3. QA
+
+- [x] 3.1 Verify Dockerfile build stages are correct and complete
+- [x] 3.2 Verify .dockerignore covers all sensitive/unnecessary files