command overrides do not work when using the include directive

**Describe the bug**

When using the `include` directive in a compose YAML file the `command` block for a service is never overriden rather it remains the same as that of the original file.

**To Reproduce**

Here is a [Public Gist](https://gist.github.com/shantanoo-desai/89243ac937b0dbe475319c229dadc514) of a minimal reproducible example which captures and compares the bug and expected behavior of Docker Compose / Podman Compose

Here is the summarized code for re-production:

```yaml
# compose.service.yml
services:
test-svc:
image: docker.io/library/alpine:latest
command:
# trivial command (will never be executed)
- run
- test
```

```yaml
# compose.include.yml
include:
- compose.service.yml
```

```yaml
# compose.override.yml
services:
test-svc:
command:
# trivial command (will never be executed)
# override: run test -> run ALL test
- run
- ALL
- test
```

Steps to reproduce the behavior:

based on the Gist:

```bash
make -f Makefile.podman with-include
```
OR directly:

```bash
podman-compose -f compose.include.yml -f compose.override.yml config
```

**Expected behavior**
A clear and concise description of what you expected to happen.

The `podman-compose -f compose.include.yml -f compose.override.yml config` should override the commands based on the `compose.override.yml` file:

```bash
services:
test-svc:
command:
# trivial command (will never be executed)
# override: run test -> run ALL test
- run
- ALL
- test
```

**Actual behavior**
What is the behavior you actually got and that should not happen.

current output:

```bash
podman-compose -f compose.include.yml -f compose.override.yml config
services:
test-svc:
command:
- run
- test
image: docker.io/library/alpine:latest
```

**Environment:**

OS: Linux

Podman Version
```bash
$ podman version
Client: Podman Engine
Version: 5.6.0
API Version: 5.6.0
Go Version: go1.25.3 (Red Hat 1.25.3-1.el10_1)
Git Commit: b194cd996eb74ecf0ff67d710d4b2aaa90e1c27e
Built: Mon Jan 12 00:00:00 2026
Build Origin: Rocky Linux Build System
OS/Arch: linux/amd64
```

Podman Compose Version

```bash
$ podman-compose version
podman-compose version 1.5.0
podman version 5.6.0
```

**Additional context**

None

Start with Makefile.podman and the compose.include.yml/compose.override.yml reproduction, then trace how include processing and subsequent file overrides are merged. Confirm the current config output and add coverage for the command override; done means config reports run, ALL, test while retaining the included service.

Written by the indexing model from the issue text.