Add AI research review workflows

prompts/related.md

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+---
+description: Build a related-work map and justify why an AI research project needs to exist.
+---
+Build the related-work and justification view for: $@
+
+Requirements:
+- Search for the closest and strongest relevant papers first.
+- Prefer the `researcher` subagent when the space is broad or moving quickly.
+- Identify:
+  - foundational papers
+  - closest prior work
+  - strongest recent competing approaches
+  - benchmarks and evaluation norms
+  - critiques or known weaknesses in the area
+- For each important paper, explain why it matters to this project.
+- Be explicit about what real gap remains after considering the strongest prior work.
+- If the project is not differentiated enough, say so clearly.
+- Save the artifact to `outputs/` as markdown if the user wants a durable result.
+- End with a `Sources` section containing direct URLs.