strip session-added comments

Dockerfile

@@ -16,7 +16,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 RUN cargo install cargo-chef --locked --version 0.1.78
 WORKDIR /build
 
-# ----- planner: dependency recipe (changes only when manifests/lockfile change) -----
 FROM chef AS planner
 COPY . .
 RUN cargo chef prepare --recipe-path recipe.json
@@ -27,14 +26,10 @@ FROM chef AS builder
 # Features: federation (ActivityPub), nats (EVENT_BUS_BACKEND=nats).
 # Build without federation:  --build-arg FEATURES=
 # To add NATS support:       --build-arg FEATURES=federation,nats
-# Declared before cook so cook and build compile identical feature sets.
 ARG FEATURES=federation
 
-# .cargo carries the registry config needed to fetch private crates
 COPY .cargo ./.cargo
 COPY --from=planner /build/recipe.json recipe.json
-# target/ is a normal layer (no cache mount) so the cooked deps live in the image
-# layer cache; only the registry/git download caches are mounted.
 RUN --mount=type=cache,target=/usr/local/cargo/registry,sharing=locked \
     --mount=type=cache,target=/usr/local/cargo/git,sharing=locked \
     cargo chef cook --release -p server -p worker --no-default-features --features "${FEATURES}" --recipe-path recipe.json