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/design.md

@@ -0,0 +1,13 @@
+## Context
+Node.js 18+, TypeScript compiled to `dist/`. Production image must be minimal, non-root, and use the compiled output only.
+
+## Decisions
+- Multi-stage build: `builder` stage compiles TypeScript; `production` stage copies `dist/` only
+- Base image: `node:18-alpine` — minimal footprint
+- Non-root user: `node` user (built into node alpine image)
+- No dev dependencies in production image — only `npm ci --omit=dev`
+- Health check: `wget` on `localhost:3000/health` — but no `/health` endpoint exists yet, so omit health check from Dockerfile; it is set in docker-compose.yml via pg_isready/redis-cli patterns
+- `.dockerignore` excludes: `node_modules`, `dist`, `coverage`, `tests`, `.env`, `*.pem`, `vj_notes`, `.cto-workspace`, `.claude`
+
+## Open Questions
+*(none)*