fix(cli): install codex CLI in codex uv Dockerfiles

Round-3 Greptile parity: the uv-path Dockerfile-uv.j2 variants (default, sync,
temporal) installed node/npm but not the `codex` CLI. Mirror the
npm install -g @openai/codex step already added to the pip Dockerfiles so
use_uv=True containers are functional.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: declan-scale

src/agentex/lib/cli/templates/default-codex/Dockerfile-uv.j2

@@ -20,6 +20,10 @@ RUN apt-get update && apt-get install -y \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/**
 
+# Install the codex CLI: the agent shells out to `codex` on every turn, so the
+# binary must be present in the runtime image.
+RUN npm install -g @openai/codex
+
 ENV UV_COMPILE_BYTECODE=1
 ENV UV_LINK_MODE=copy
 ENV UV_HTTP_TIMEOUT=1000

src/agentex/lib/cli/templates/sync-codex/Dockerfile-uv.j2

@@ -20,6 +20,10 @@ RUN apt-get update && apt-get install -y \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/**
 
+# Install the codex CLI: the agent shells out to `codex` on every turn, so the
+# binary must be present in the runtime image.
+RUN npm install -g @openai/codex
+
 ENV UV_COMPILE_BYTECODE=1
 ENV UV_LINK_MODE=copy
 ENV UV_HTTP_TIMEOUT=1000

src/agentex/lib/cli/templates/temporal-codex/Dockerfile-uv.j2

@@ -20,6 +20,10 @@ RUN apt-get update && apt-get install -y \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/**
 
+# Install the codex CLI: the activity shells out to `codex` on every turn, so
+# the binary must be present in the runtime image.
+RUN npm install -g @openai/codex
+
 # Install tctl (Temporal CLI)
 RUN ARCH="$(uname -m)" && \
     case "$ARCH" in x86_64) TCTL_ARCH=amd64 ;; aarch64|arm64) TCTL_ARCH=arm64 ;; *) TCTL_ARCH=amd64 ;; esac && \