feat(docker): restore in-app self-update in the Compose deployment

Codeman running under docker/docker-compose.yaml lost the ability to update
itself from App Settings -> Updates. The image had no .git (excluded by
.dockerignore), so the install reported as "unknown"; there was no init system
for detectSupervisor() to find; the runtime stage had neither devDependencies
nor a build toolchain; and a pull into the baked /opt/codeman would have landed
in the container's writable layer and been discarded by the next `up`.

Restore it through configuration rather than a second updater, so the release
channel, auto-stash, status file and boot reconcile are all reused unchanged:

- The checkout Compose builds from is bind-mounted over /opt/codeman, so the
  update's git checkout and rebuild land on the host and survive recreation.
- The restart is the server exiting; `restart: unless-stopped` relaunches the
  container on the new dist/. This is the one supervisor whose updater does NOT
  outlive the restart, which is safe only because the terminal "restarting"
  marker is written first.
- node_modules and dist are named volumes over the bind mount, so
  container-compiled native modules never enter the host checkout.
- The runtime image keeps devDependencies and gains python3/make/g++, since
  `npm run build` is tsc + esbuild and node-pty has no Linux prebuild.

An in-place container update applies code only, because a restart reuses the
existing image and config. evaluateEnvironmentGate() reads the target release's
own files with `git show <tag>:<path>` and refuses when server.Dockerfile or
docker-compose.yaml changed, when .env.example gained keys the user's .env
lacks, or when the restart policy would not bring the container back. The
missing-key check matters most: Compose resolves an unset ${VAR} to the empty
string and starts anyway, so a new required setting would otherwise arrive as a
silently blank variable. Every unknown fails open, and the gate is re-evaluated
server-side on POST /api/system/update.

The four global agent CLIs are pinned, because an unpinned CLI bump is the one
environment change no diff-derived gate can see; pinning turns it into a
Dockerfile change the gate already detects.

Adds test/docker-compose-env-parity.test.ts as the merge-side guard (every
compose ${VAR} has an .env.example entry and the reverse) and
test/docker-self-update.test.ts for the pure gate decisions.

Documented in docs/docker-self-update.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013yAQ2y9t81jzSfpStUxx5T

docker/server.Dockerfile

@@ -12,9 +12,12 @@ WORKDIR /opt/codeman
 
 COPY . .
 
+# devDependencies are deliberately KEPT (no `npm prune --omit=dev`). The in-app
+# updater rebuilds from inside this container, and `npm run build` is tsc +
+# esbuild — both devDependencies. Pruning them saves image size and takes the
+# self-updater with it. See docs/docker-self-update.md.
 RUN npm ci \
  && npm run build \
- && npm prune --omit=dev --ignore-scripts \
  && npm cache clean --force
 
 # The Docker CLI talks to the host daemon through the socket mounted by
@@ -25,13 +28,21 @@ ARG CODEMAN_RUNTIME_USER=opencode
 ARG PUID=1000
 ARG PGID=1000
 
+# python3/make/g++ are here for the SELF-UPDATER, not for this build. An update
+# runs `npm install` inside the running container, and node-pty ships no Linux
+# prebuild, so a release that bumps it compiles from source right here. Without
+# a toolchain that install fails and the update rolls back — every time, on the
+# releases that need it most. Same reason install.sh installs one on bare hosts.
 RUN apt-get update \
  && apt-get install -y --no-install-recommends \
       ca-certificates \
       curl \
+      g++ \
       git \
+      make \
       openssh-client \
       procps \
+      python3 \
       ripgrep \
       tmux \
  && rm -rf /var/lib/apt/lists/*
@@ -59,11 +70,23 @@ COPY --from=docker:29-cli \
 
 # Keep credentials out of the image. Users authenticate these CLIs at runtime
 # through Codeman sessions, and the configured host bind mount retains state.
+#
+# ⚠️ PINNED ON PURPOSE. Unpinned, the agent CLI versions a user ends up with are
+# a function of WHEN their image was built, not of any commit — so a Codeman
+# release that depends on newer CLI behaviour (the trust-dialog handling is
+# pinned to Claude Code 2.1.252's layout; wheel forwarding to >= 2.1.187) breaks
+# on an older image with no diff anywhere to explain why. In-app updates make
+# rebuilds RARER, which makes that drift worse. Pinning turns "this release needs
+# a newer CLI" into a Dockerfile change, which the updater's environment gate
+# already detects and refuses (docs/docker-self-update.md).
+#
+# Bump these deliberately, in a release. `--no-cache` is still needed to rebuild
+# this layer when only the pins change upstream.
 RUN npm install --global \
-      @anthropic-ai/claude-code \
-      @google/gemini-cli \
-      @openai/codex \
-      opencode-ai \
+      @anthropic-ai/claude-code@2.1.258 \
+      @google/gemini-cli@0.58.0 \
+      @openai/codex@0.152.1 \
+      opencode-ai@1.18.26 \
  && npm cache clean --force
 
 # Keep the web server and every local Codeman session unprivileged. PUID and
@@ -103,7 +126,12 @@ WORKDIR /opt/codeman
 
 COPY --from=build /opt/codeman /opt/codeman
 
-ENV CODEMAN_PORT=3000 \
+# CODEMAN_IN_CONTAINER tells the self-updater it must restart by exiting rather
+# than by asking an init system that is not here (src/web/self-update.ts).
+# NODE_ENV stays `production`; the updater passes `npm install --include=dev`
+# explicitly, since that value would otherwise omit the build toolchain.
+ENV CODEMAN_IN_CONTAINER=1 \
+    CODEMAN_PORT=3000 \
     HOME=/home/${CODEMAN_RUNTIME_USER} \
     NODE_ENV=production