feat(agent-images): update Debian and add Podman

bot_bottle/contrib/claude/Dockerfile

@@ -10,7 +10,7 @@
 
 # Current Node LTS; slim variant keeps the image small while still
 # providing apt-get for any future additions.
-FROM node:22-slim
+FROM node:22-trixie-slim
 
 # Install runtime system deps. claude-code shells out to git for several
 # features (status checks, commits, PR creation) — without git in the
@@ -21,7 +21,14 @@ FROM node:22-slim
 # to it) works against egress's bumped TLS without the agent needing
 # local DNS.
 RUN apt-get update \
-  && apt-get install -y --no-install-recommends git ca-certificates curl ripgrep iproute2 dnsutils \
+  && apt-get install -y --no-install-recommends \
+  git \
+  ca-certificates \
+  curl \
+  podman \
+  ripgrep \
+  iproute2 \
+  dnsutils \
   && rm -rf /var/lib/apt/lists/*
 
 # App-specific deps. Python isn't required by claude-code itself

bot_bottle/contrib/codex/Dockerfile

@@ -3,10 +3,16 @@
 # Mirrors the default Claude image shape: Node LTS, git/network tooling,
 # non-root node user, and the provider CLI installed for that user.
 
-FROM node:22-slim
+FROM node:22-trixie-slim
 
 RUN apt-get update \
-  && apt-get install -y --no-install-recommends git ca-certificates curl procps ripgrep \
+  && apt-get install -y --no-install-recommends \
+  git \
+  ca-certificates \
+  curl \
+  podman \
+  procps \
+  ripgrep \
   && rm -rf /var/lib/apt/lists/*
 
 # App-specific deps. Python isn't required by codex itself

bot_bottle/contrib/pi/Dockerfile

@@ -2,7 +2,7 @@
 #
 # Node LTS, git/network tooling, and the Pi coding-agent CLI installed globally.
 
-FROM node:22-slim
+FROM node:22-trixie-slim
 
 RUN apt-get update \
   && apt-get install -y --no-install-recommends \
@@ -10,6 +10,7 @@ RUN apt-get update \
   ca-certificates \
   curl \
   fd-find \
+  podman \
   ripgrep \
   && ln -s /usr/bin/fdfind /usr/local/bin/fd \
   && rm -rf /var/lib/apt/lists/*

docs/prds/prd-new-modernize-built-in-agent-images.md

@@ -0,0 +1,43 @@
+# PRD prd-new: Modernize built-in agent images
+
+- **Status:** Draft
+- **Author:** Codex
+- **Created:** 2026-07-21
+- **Issue:** #451
+
+## Summary
+
+Keep every built-in agent provider on Debian's current stable release and make
+Podman available inside each image. This gives agents a consistent, modern
+userspace and an OCI container tool without requiring per-project setup.
+
+## Problem
+
+The Claude, Codex, and Pi images inherit the generic `node:22-slim` tag. That
+tag does not state which Debian release the project supports and currently
+leaves the images on the older Bookworm release. None of the built-in images
+installs Podman, so tasks that need to inspect or build OCI images must first
+modify the bottle or cannot run at all.
+
+## Goals / success criteria
+
+- Every Dockerfile under `bot_bottle/contrib/*/Dockerfile` explicitly inherits
+  `node:22-trixie-slim`, based on Debian 13 (the current stable release).
+- Every built-in agent image installs Podman from Debian stable.
+- A shared test enforces both requirements for current and future built-in
+  providers.
+
+## Non-goals
+
+- Configuring privileged or nested-container execution for bottles.
+- Pinning Podman outside Debian's stable package repository.
+- Changing the Node.js or agent CLI release policy.
+
+## Design
+
+Use the explicit `node:22-trixie-slim` base rather than the floating `slim`
+variant. Install the `podman` package with each image's existing `apt-get`
+dependency layer, so package metadata and caches are still removed in the same
+layer. Treat Debian stable as the Podman stability and update channel; this
+keeps the images stdlib/distribution-first and avoids adding a third-party
+package repository.

tests/unit/test_builtin_agent_images.py

@@ -0,0 +1,34 @@
+"""Unit contracts shared by all built-in agent images."""
+
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+
+_CONTRIB_DIR = Path(__file__).resolve().parents[2] / "bot_bottle/contrib"
+_AGENT_DOCKERFILES = tuple(sorted(_CONTRIB_DIR.glob("*/Dockerfile")))
+
+
+class TestBuiltinAgentImages(unittest.TestCase):
+    def test_all_use_debian_trixie_stable(self):
+        self.assertTrue(_AGENT_DOCKERFILES)
+        for dockerfile in _AGENT_DOCKERFILES:
+            with self.subTest(provider=dockerfile.parent.name):
+                self.assertRegex(
+                    dockerfile.read_text(),
+                    r"(?m)^FROM node:22-trixie-slim\s*$",
+                )
+
+    def test_all_install_podman(self):
+        for dockerfile in _AGENT_DOCKERFILES:
+            with self.subTest(provider=dockerfile.parent.name):
+                self.assertRegex(
+                    dockerfile.read_text(),
+                    re.compile(r"(?m)^\s*podman(?:\s|\\|$)"),
+                )
+
+
+if __name__ == "__main__":
+    unittest.main()