docs: propose workflow readability improvements

[miyaontherelay]

Summary

• add a focused proposal doc for making Relay workflows more readable across YAML, TypeScript, and Python
• cover canonical workflow shape, prompt externalization, structured outputs, agent profiles, reusable step templates, and render/lint tooling
• suggest a phased rollout aimed at improving reviewability without losing functionality

Scope

• docs only
• no runtime or schema changes in this PR

Why

Workflow authoring is powerful today, but review readability still lags behind. This proposal lays out a concrete path to make workflows easier to skim, reason about, and evolve while preserving the current capabilities.

Very short outline

1. Separate workflow structure from bulky prompt payloads
2. Align YAML, TypeScript, and Python around one canonical workflow model
3. Standardize step shape, naming, descriptions, and structured outputs
4. Move runtime details into profiles/defaults instead of per-step noise
5. Add render/lint/normalize tooling to improve reviewability

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.