Feat v0.3.8 distribution (#21)

Bundled packages auto-install on first boot for zero-config first run.
Builder image for faster custom builds. Per-environment allowlists for
K8s/Helm (dev=all, test=all, prod=skip).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -4,7 +4,8 @@
 # Stage 1: Build Go backend
 # Stage 2: Download JS vendor libs (marked, DOMPurify)
 # Stage 3: Build CM6 editor bundle (esbuild)
-# Stage 4: Production image (nginx + backend)
+# Stage 4: Build bundled packages (.pkg archives)
+# Stage 5: Production image (nginx + backend)
 #
 # Vendor libs are baked in during build so the
 # app works in disconnected environments
@@ -57,7 +58,13 @@ COPY scripts/build-editor.sh /build/scripts/build-editor.sh
 RUN cd /build/src/editor && npm ci --loglevel=warn
 RUN sh /build/scripts/build-editor.sh /build/dist
 
-# ── Stage 4: Production ─────────────────────
+# ── Stage 4: Build bundled packages ─────────
+FROM alpine:3 AS packages
+RUN apk add --no-cache zip bash
+COPY packages/ /packages/
+RUN cd /packages && bash build.sh
+
+# ── Stage 5: Production ─────────────────────
 FROM nginx:1-alpine
 
 RUN apk add --no-cache bash git
@@ -85,6 +92,9 @@ COPY --from=vendor /vendor/katex/katex.min.css /usr/share/nginx/html/vendor/kate
 COPY --from=vendor /vendor/katex/fonts/ /usr/share/nginx/html/vendor/katex/fonts/
 COPY --from=cm6-build /build/dist/ /usr/share/nginx/html/vendor/codemirror/
 
+# Bundled packages (v0.3.8) — auto-installed on first run
+COPY --from=packages /dist/ /app/bundled-packages/
+
 # nginx config (template — envsubst injects BASE_PATH at runtime)
 COPY nginx.conf.template /etc/nginx/templates/default.conf.template
 # Only substitute BASE_PATH — preserve nginx variables ($host, $uri, etc.)