Add agentic human-in-the-loop pipeline example

[htahir1]

Adds examples/agentic_hitl_pipeline/, a runnable dynamic pipeline that plans agent tasks, fans them out with step.map, summarizes the results, pauses on zenml.wait for human approval, and branches the final action on the decision. Step outputs are named with Annotated for clean lineage.

Adds cross-links from docs/book to the new example:

• getting-started/your-first-ai-pipeline.md: include in Related examples
• how-to/steps-pipelines/dynamic_pipelines.md: link from map-reduce
• how-to/steps-pipelines/wait_resume.md: new Agentic approval section

Describe changes

I implemented/fixed _ to achieve _.

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• IMPORTANT: I made sure that my changes are reflected properly in the following resources:
  • ZenML Docs
  • Dashboard: Needs to be communicated to the frontend team.
  • Templates: Might need adjustments (that are not reflected in the template tests) in case of non-breaking changes and deprecations.
  • Projects: Depending on the version dependencies, different projects might get affected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

[github-actions]

Documentation Link Check Results

✅ Absolute links check passed
✅ Relative links check passed
_{Last checked: 2026-05-20 09:45:27 UTC}