fix(docker): install pnpm in the Compose server image

`dsh plugin` spawns a literal `pnpm` with no npm fallback, so the Run
menu's "DeepSeek - add a terminal profile" button failed with
`dsh: pnpm not found on PATH` (exit 127) on the server image. The agent
image already installs pnpm for the same reason (#352). Pin pnpm@12.6.0
in the runtime-writable CLI prefix and note it in the DeepSeek doc.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GuHtuPiHXdykq9T6rKQJ9n

.changeset/serverpnpm3.md

@@ -0,0 +1,5 @@
+---
+"aicodeman": patch
+---
+
+Install pnpm in the Docker Compose server image. `dsh plugin` spawns a literal `pnpm` with no npm fallback, so the Run menu's "DeepSeek - add a terminal profile" button failed with `dsh: pnpm not found on PATH` in that image. Because this changes `server.Dockerfile`, the in-app updater will ask Compose deployments to rebuild the image (`Update-Codeman.sh`) rather than apply this release in place.

docker/server.Dockerfile

@@ -214,11 +214,19 @@ RUN set -eux; \
 # system directories for the root part of the start.
 ENV NPM_CONFIG_PREFIX=/opt/codeman-cli
 ENV PATH=$PATH:/opt/codeman-cli/bin
+# pnpm is not an agent CLI: it is here because `dsh plugin` (DeepSeek Harness, which
+# this image leaves to be installed at runtime, see SERVER_INTENTIONAL_OMISSIONS in
+# test/docker-agent-image-coverage.test.ts) spawns a literal `pnpm` with no npm
+# fallback, so the Run menu's "DeepSeek - add a terminal profile" button failed
+# with `dsh: pnpm not found on PATH` (exit 127) on this image. The agent image
+# already carries it for the same reason (#352). It lives in the same
+# runtime-writable prefix as the CLIs, so a session can update it in place.
 RUN npm install --global \
       @anthropic-ai/claude-code@2.1.258 \
       @google/gemini-cli@0.58.0 \
       @openai/codex@0.152.1 \
       opencode-ai@1.18.26 \
+      pnpm@12.6.0 \
  && npm cache clean --force
 
 # Keep the web server and every local Codeman session unprivileged. PUID and

docs/deepseek-integration.md

@@ -53,7 +53,9 @@ that spawns a literal `pnpm` with no npm fallback, so without one it exits 127 w
 surfaces that same line as the install error. `npm install -g pnpm` (or
 `corepack enable pnpm`) is the fix. This is what broke the Docker agent image in
 [#352](https://github.com/Ark0N/Codeman/issues/352); the image now installs pnpm
-alongside `dsh`.
+alongside `dsh`. The Compose server image (`docker/server.Dockerfile`) does not
+ship `dsh`, since it is installed at runtime, but it does ship pnpm so the UI
+button works there too.
 
 Codeman's default is `@deepseek-harness-tui/dsh-tui` because it is by a wide
 margin the most used community TUI, it is MIT, and it implements the status