docs(roadmap): reset planning for v0.5.x

[EffortlessSteven]

Summary

• Reset roadmap Now to v0.5.0.
• Add a planning follow-up document with milestone+issue copy-ready details (docs/explanation/roadmap-followups-0251.md).
• Link roadmap to follow-up execution plan.

Why

Post-release planning was still pointed at v0.4.1 in docs while GitHub release state is already v0.4.1. This PR creates the planning split for tracked execution.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0ad62c39-b54a-4c20-be7b-eb9042079d6d

📥 Commits

Reviewing files that changed from the base of the PR and between 08475b3 and 1666d98.

📒 Files selected for processing (2)

• docs/explanation/roadmap-followups-0251.md
• docs/explanation/roadmap.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/0.5.0-planning

📝 Coding Plan

• Generate coding plan for human review comments

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