Add workshop step 23: Test Your Prompt Ideas with A/B Experiments

[Copilot]

The curriculum (steps 1–22) teaches building, scheduling, memory, sub-agents, and error handling — but never gives learners a principled way to measure whether a prompt change actually improves output. Step 23 closes that gap with the experiments: frontmatter field.

New file: workshop/23-ab-experiments.md

Covers the full experiment lifecycle:

• How the round-robin works — state loaded from experiments/{workflow-id} branch, lowest-count variant picked, counters saved, artifact uploaded, variant injected before agent sees the prompt
• Frontmatter syntax — experiments: block with named experiment and variant array; naming rules ([a-zA-Z_][a-zA-Z0-9_]*, non-matching names silently skipped at compile time)
• Task brief integration — {{#if experiments.<name> == "<variant>" }} blocks to swap instructions per variant

experiments:
  output_style: [concise, detailed]

{{#if experiments.output_style == "concise" }}
Write a maximum of 5 bullet points. Each bullet is one sentence.
{{#else}}
Write a structured report with sections: open issues, merged PRs, CI status.
{{#endif}}

• Inspecting results — downloading the experiment artifact JSON to check per-variant assignment counts
• Concluding — promote winning variant to baseline, remove experiments: block, recompile; do not remove early or state resets

Updated: workshop/README.md

Added step 23 row to the curriculum table.

[pelikhan]

@copilot emphasize on using the /agentic-workflows skill to author experiments

[Copilot]

@copilot emphasize on using the /agentic-workflows skill to author experiments

Done in the latest commit. The "Add an experiment to your workflow" section now leads with the agent path: a [!TIP] callout establishes agents edit agents as the preference, followed by a ready-to-paste Copilot prompt that instructs the agent to use the /agentic-workflows skill and handle the full edit-compile-commit cycle. The manual frontmatter editing steps are kept as a secondary "alternative" subsection.