feat(compression): add summary_base_url + move compression to config-only

- Add summary_base_url config option to compression block for custom
  OpenAI-compatible endpoints (e.g. zai, DeepSeek, Ollama)
- Remove compression env var bridges from cli.py and gateway/run.py
  (CONTEXT_COMPRESSION_* env vars no longer set from config)
- Switch run_agent.py to read compression config directly from
  config.yaml instead of env vars
- Fix backwards-compat block in _resolve_task_provider_model to also
  fire when auxiliary.compression.provider is 'auto' (DEFAULT_CONFIG
  sets this, which was silently preventing the compression section's
  summary_* keys from being read)
- Add test for summary_base_url config-to-client flow
- Update docs to show compression as config.yaml-only

Closes #1591
Based on PR #1702 by @uzaylisak

tools/environments/docker.py

@@ -458,6 +458,20 @@ class DockerEnvironment(BaseEnvironment):
         """Stop and remove the container. Bind-mount dirs persist if persistent=True."""
         self._inner.cleanup()
 
+        if not self._persistent and self._container_id:
+            # Inner cleanup only runs `docker stop` in background; container is left
+            # as stopped. When container_persistent=false we must remove it.
+            docker_exe = find_docker() or self._inner.config.executable
+            try:
+                subprocess.run(
+                    [docker_exe, "rm", "-f", self._container_id],
+                    capture_output=True,
+                    timeout=30,
+                )
+            except Exception as e:
+                logger.warning("Failed to remove non-persistent container %s: %s", self._container_id, e)
+            self._container_id = None
+
         if not self._persistent:
             import shutil
             for d in (self._workspace_dir, self._home_dir):