feat: initial Beta 1 release

- soju raw connector with event playback and CHATHISTORY fallback
- SQLite store with msgid de-dup and retention job
- Mentions + Pushover + tuning; structured JSON logs
- Summaries: concise, link-following, multi-line grouping
- HTTP: /healthz, /ready, /tail, /trigger, /metrics
- Docker: distroless, healthcheck, version metadata
- Docs: README, CHANGELOG, compose

Dockerfile

@@ -0,0 +1,23 @@
+# Build stage
+FROM golang:1.23-alpine AS build
+WORKDIR /src
+COPY . .
+ARG VERSION=dev
+ARG VCS_REF=unknown
+ARG BUILD_DATE
+RUN --mount=type=cache,target=/root/.cache/go-build \
+	--mount=type=cache,target=/go/pkg/mod \
+	apk add --no-cache ca-certificates && \
+	CGO_ENABLED=0 go build -ldflags "-s -w -X main.version=${VERSION} -X main.commit=${VCS_REF} -X main.builtAt=${BUILD_DATE}" -o /out/sojuboy ./cmd/sojuboy
+
+# Final image
+FROM gcr.io/distroless/static
+WORKDIR /
+COPY --from=build /out/sojuboy /sojuboy
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=3s --retries=3 CMD ["/sojuboy","--health"]
+ENTRYPOINT ["/sojuboy"]
+
+
+