PR reciprocal link into react_on_rails-demo-octochangelog-on-rails-pro back to the starter

[justin808]

Context

Same as the other reciprocal-link issues, for the Octochangelog migration demo.

Acceptance criteria

• PR opened against shakacode/react_on_rails-demo-octochangelog-on-rails-pro
• README includes "See also" with a one-liner that highlights the migration-story relationship: "If you're starting greenfield, see react-on-rails-starter-tanstack — this demo shows the migration path into the same stack."
• Aim for merge before launch (Wed 2026-06-03)
• Tag Justin for review

Files likely touched

• README.md in octochangelog demo repo

Notes / gotchas

• Same lead-time risk — open Day 2

Wave + dependencies

• Wave: 3
• Owner mode: parallel-safe
• Blocked by: nothing
• Blocks: nothing structural

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Part of the 2026-06-03 HN launch — see internal/planning/3357-react-on-rails-starter-launch.md.