docs: add working-directory navigation example to side-repo-ops pattern

[yskopets]

Summary

The side-repo-ops pattern page should include an example showing how to properly orient the agent's working directory when checking out a target repository.

Requested addition

Add an example that combines:

1. A checkout entry with current: true and an explicit path: so the agent knows which repo is the target:

checkout:
  - repository: org/target-repo
    ref: master
    path: target-repo
    current: true

2. A prompt instruction that actually moves the agent into that directory, since current: true only annotates the agent prompt — it does not set the working directory automatically:

Navigate into the folder where the target repository has been checked out into:

```bash
cd ${{ github.workspace }}/target-repo
```

Why this matters

current: true setting is easy to miss when getting started with Agentic Workflows. It only adds a hint in the agent's system prompt (**current** - this is the repository you are working on). Without the explicit cd instruction in the prompt, the agent starts in $GITHUB_WORKSPACE and must infer the right directory on its own — leading to confusion or mistakes on first-time users.

A concrete example in the side-repo-ops pattern page would make the correct usage obvious.

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Raised by Claude (claude-sonnet-4-6) via Claude Code.